Index: frontend/node_modules/signal-exit/LICENSE.txt
===================================================================
--- frontend/node_modules/signal-exit/LICENSE.txt	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/signal-exit/LICENSE.txt	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,16 @@
+The ISC License
+
+Copyright (c) 2015, Contributors
+
+Permission to use, copy, modify, and/or distribute this software
+for any purpose with or without fee is hereby granted, provided
+that the above copyright notice and this permission notice
+appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE
+LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
+OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
Index: frontend/node_modules/signal-exit/README.md
===================================================================
--- frontend/node_modules/signal-exit/README.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/signal-exit/README.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,39 @@
+# signal-exit
+
+[![Build Status](https://travis-ci.org/tapjs/signal-exit.png)](https://travis-ci.org/tapjs/signal-exit)
+[![Coverage](https://coveralls.io/repos/tapjs/signal-exit/badge.svg?branch=master)](https://coveralls.io/r/tapjs/signal-exit?branch=master)
+[![NPM version](https://img.shields.io/npm/v/signal-exit.svg)](https://www.npmjs.com/package/signal-exit)
+[![Standard Version](https://img.shields.io/badge/release-standard%20version-brightgreen.svg)](https://github.com/conventional-changelog/standard-version)
+
+When you want to fire an event no matter how a process exits:
+
+* reaching the end of execution.
+* explicitly having `process.exit(code)` called.
+* having `process.kill(pid, sig)` called.
+* receiving a fatal signal from outside the process
+
+Use `signal-exit`.
+
+```js
+var onExit = require('signal-exit')
+
+onExit(function (code, signal) {
+  console.log('process exited!')
+})
+```
+
+## API
+
+`var remove = onExit(function (code, signal) {}, options)`
+
+The return value of the function is a function that will remove the
+handler.
+
+Note that the function *only* fires for signals if the signal would
+cause the process to exit.  That is, there are no other listeners, and
+it is a fatal signal.
+
+## Options
+
+* `alwaysLast`: Run this handler after any other signal or exit
+  handlers.  This causes `process.emit` to be monkeypatched.
Index: frontend/node_modules/signal-exit/index.js
===================================================================
--- frontend/node_modules/signal-exit/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/signal-exit/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,202 @@
+// Note: since nyc uses this module to output coverage, any lines
+// that are in the direct sync flow of nyc's outputCoverage are
+// ignored, since we can never get coverage for them.
+// grab a reference to node's real process object right away
+var process = global.process
+
+const processOk = function (process) {
+  return process &&
+    typeof process === 'object' &&
+    typeof process.removeListener === 'function' &&
+    typeof process.emit === 'function' &&
+    typeof process.reallyExit === 'function' &&
+    typeof process.listeners === 'function' &&
+    typeof process.kill === 'function' &&
+    typeof process.pid === 'number' &&
+    typeof process.on === 'function'
+}
+
+// some kind of non-node environment, just no-op
+/* istanbul ignore if */
+if (!processOk(process)) {
+  module.exports = function () {
+    return function () {}
+  }
+} else {
+  var assert = require('assert')
+  var signals = require('./signals.js')
+  var isWin = /^win/i.test(process.platform)
+
+  var EE = require('events')
+  /* istanbul ignore if */
+  if (typeof EE !== 'function') {
+    EE = EE.EventEmitter
+  }
+
+  var emitter
+  if (process.__signal_exit_emitter__) {
+    emitter = process.__signal_exit_emitter__
+  } else {
+    emitter = process.__signal_exit_emitter__ = new EE()
+    emitter.count = 0
+    emitter.emitted = {}
+  }
+
+  // Because this emitter is a global, we have to check to see if a
+  // previous version of this library failed to enable infinite listeners.
+  // I know what you're about to say.  But literally everything about
+  // signal-exit is a compromise with evil.  Get used to it.
+  if (!emitter.infinite) {
+    emitter.setMaxListeners(Infinity)
+    emitter.infinite = true
+  }
+
+  module.exports = function (cb, opts) {
+    /* istanbul ignore if */
+    if (!processOk(global.process)) {
+      return function () {}
+    }
+    assert.equal(typeof cb, 'function', 'a callback must be provided for exit handler')
+
+    if (loaded === false) {
+      load()
+    }
+
+    var ev = 'exit'
+    if (opts && opts.alwaysLast) {
+      ev = 'afterexit'
+    }
+
+    var remove = function () {
+      emitter.removeListener(ev, cb)
+      if (emitter.listeners('exit').length === 0 &&
+          emitter.listeners('afterexit').length === 0) {
+        unload()
+      }
+    }
+    emitter.on(ev, cb)
+
+    return remove
+  }
+
+  var unload = function unload () {
+    if (!loaded || !processOk(global.process)) {
+      return
+    }
+    loaded = false
+
+    signals.forEach(function (sig) {
+      try {
+        process.removeListener(sig, sigListeners[sig])
+      } catch (er) {}
+    })
+    process.emit = originalProcessEmit
+    process.reallyExit = originalProcessReallyExit
+    emitter.count -= 1
+  }
+  module.exports.unload = unload
+
+  var emit = function emit (event, code, signal) {
+    /* istanbul ignore if */
+    if (emitter.emitted[event]) {
+      return
+    }
+    emitter.emitted[event] = true
+    emitter.emit(event, code, signal)
+  }
+
+  // { <signal>: <listener fn>, ... }
+  var sigListeners = {}
+  signals.forEach(function (sig) {
+    sigListeners[sig] = function listener () {
+      /* istanbul ignore if */
+      if (!processOk(global.process)) {
+        return
+      }
+      // If there are no other listeners, an exit is coming!
+      // Simplest way: remove us and then re-send the signal.
+      // We know that this will kill the process, so we can
+      // safely emit now.
+      var listeners = process.listeners(sig)
+      if (listeners.length === emitter.count) {
+        unload()
+        emit('exit', null, sig)
+        /* istanbul ignore next */
+        emit('afterexit', null, sig)
+        /* istanbul ignore next */
+        if (isWin && sig === 'SIGHUP') {
+          // "SIGHUP" throws an `ENOSYS` error on Windows,
+          // so use a supported signal instead
+          sig = 'SIGINT'
+        }
+        /* istanbul ignore next */
+        process.kill(process.pid, sig)
+      }
+    }
+  })
+
+  module.exports.signals = function () {
+    return signals
+  }
+
+  var loaded = false
+
+  var load = function load () {
+    if (loaded || !processOk(global.process)) {
+      return
+    }
+    loaded = true
+
+    // This is the number of onSignalExit's that are in play.
+    // It's important so that we can count the correct number of
+    // listeners on signals, and don't wait for the other one to
+    // handle it instead of us.
+    emitter.count += 1
+
+    signals = signals.filter(function (sig) {
+      try {
+        process.on(sig, sigListeners[sig])
+        return true
+      } catch (er) {
+        return false
+      }
+    })
+
+    process.emit = processEmit
+    process.reallyExit = processReallyExit
+  }
+  module.exports.load = load
+
+  var originalProcessReallyExit = process.reallyExit
+  var processReallyExit = function processReallyExit (code) {
+    /* istanbul ignore if */
+    if (!processOk(global.process)) {
+      return
+    }
+    process.exitCode = code || /* istanbul ignore next */ 0
+    emit('exit', process.exitCode, null)
+    /* istanbul ignore next */
+    emit('afterexit', process.exitCode, null)
+    /* istanbul ignore next */
+    originalProcessReallyExit.call(process, process.exitCode)
+  }
+
+  var originalProcessEmit = process.emit
+  var processEmit = function processEmit (ev, arg) {
+    if (ev === 'exit' && processOk(global.process)) {
+      /* istanbul ignore else */
+      if (arg !== undefined) {
+        process.exitCode = arg
+      }
+      var ret = originalProcessEmit.apply(this, arguments)
+      /* istanbul ignore next */
+      emit('exit', process.exitCode, null)
+      /* istanbul ignore next */
+      emit('afterexit', process.exitCode, null)
+      /* istanbul ignore next */
+      return ret
+    } else {
+      return originalProcessEmit.apply(this, arguments)
+    }
+  }
+}
Index: frontend/node_modules/signal-exit/package.json
===================================================================
--- frontend/node_modules/signal-exit/package.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/signal-exit/package.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,38 @@
+{
+  "name": "signal-exit",
+  "version": "3.0.7",
+  "description": "when you want to fire an event no matter how a process exits.",
+  "main": "index.js",
+  "scripts": {
+    "test": "tap",
+    "snap": "tap",
+    "preversion": "npm test",
+    "postversion": "npm publish",
+    "prepublishOnly": "git push origin --follow-tags"
+  },
+  "files": [
+    "index.js",
+    "signals.js"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/tapjs/signal-exit.git"
+  },
+  "keywords": [
+    "signal",
+    "exit"
+  ],
+  "author": "Ben Coe <ben@npmjs.com>",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/tapjs/signal-exit/issues"
+  },
+  "homepage": "https://github.com/tapjs/signal-exit",
+  "devDependencies": {
+    "chai": "^3.5.0",
+    "coveralls": "^3.1.1",
+    "nyc": "^15.1.0",
+    "standard-version": "^9.3.1",
+    "tap": "^15.1.1"
+  }
+}
Index: frontend/node_modules/signal-exit/signals.js
===================================================================
--- frontend/node_modules/signal-exit/signals.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/signal-exit/signals.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,53 @@
+// This is not the set of all possible signals.
+//
+// It IS, however, the set of all signals that trigger
+// an exit on either Linux or BSD systems.  Linux is a
+// superset of the signal names supported on BSD, and
+// the unknown signals just fail to register, so we can
+// catch that easily enough.
+//
+// Don't bother with SIGKILL.  It's uncatchable, which
+// means that we can't fire any callbacks anyway.
+//
+// If a user does happen to register a handler on a non-
+// fatal signal like SIGWINCH or something, and then
+// exit, it'll end up firing `process.emit('exit')`, so
+// the handler will be fired anyway.
+//
+// SIGBUS, SIGFPE, SIGSEGV and SIGILL, when not raised
+// artificially, inherently leave the process in a
+// state from which it is not safe to try and enter JS
+// listeners.
+module.exports = [
+  'SIGABRT',
+  'SIGALRM',
+  'SIGHUP',
+  'SIGINT',
+  'SIGTERM'
+]
+
+if (process.platform !== 'win32') {
+  module.exports.push(
+    'SIGVTALRM',
+    'SIGXCPU',
+    'SIGXFSZ',
+    'SIGUSR2',
+    'SIGTRAP',
+    'SIGSYS',
+    'SIGQUIT',
+    'SIGIOT'
+    // should detect profiler and enable/disable accordingly.
+    // see #21
+    // 'SIGPROF'
+  )
+}
+
+if (process.platform === 'linux') {
+  module.exports.push(
+    'SIGIO',
+    'SIGPOLL',
+    'SIGPWR',
+    'SIGSTKFLT',
+    'SIGUNUSED'
+  )
+}