Installing dependencies.

node_modules/spawn-error-forwarder/LICENSE

@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Ben Drucker
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

node_modules/spawn-error-forwarder/README.md

@@ -0,0 +1,33 @@
+spawn-error-forwarder [![Build Status](https://travis-ci.org/bendrucker/spawn-error-forwarder.svg?branch=master)](https://travis-ci.org/bendrucker/spawn-error-forwarder)
+=====================
+
+Emit errors on stdout stream for a spawned child process. Useful for capturing errors from a spawned process when you want the output from stdout. 
+
+## Setup
+```bash
+$ npm install spawn-error-forwarder
+```
+
+## API
+
+#### `fwd(child [, errFactory]` -> `child`
+
+Buffers `child.stderr` output. If the spawned process exits with a code `> 0`, the buffered output of `child.stderr` is used to generate an error which is emitted on `child.stdout`. By default, the error message is the output of `child.stderr`. If you provide an `errFactory` function, it will be called with `code, stderr` where `code` is the child's exit code and `stderr` is string that contains the output of `child.stderr`. `errFactory` should return an `Error` to be emitted on `child.stdout`. 
+
+## Example
+
+```js
+var fwd   = require('spawn-error-forwarder');
+var spawn = require('child_process').spawn;
+var child = spawn('git', ['log', 'non-existent-path']);
+
+fwd(child, function (code, stderr) {
+  return new Error('git log exited with ' + code + ':\n\n' + stderr);
+});
+
+child.stdout
+  .on('error', console.error.bind(console))
+  .pipe(process.stdout);
+```
+
+We want to pipe the output of `git log` to `process.stdout` but since we're providing a path that doesn't exist git will exit with a non-zero code and we'll log its output with `console.error`. 

node_modules/spawn-error-forwarder/package.json

@@ -0,0 +1,32 @@
+{
+  "name": "spawn-error-forwarder",
+  "version": "1.0.0",
+  "description": "Emit errors on stdout stream for a spawned child process",
+  "main": "./src",
+  "directories": {
+    "test": "test"
+  },
+  "scripts": {
+    "test": "mocha"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/bendrucker/spawn-error-forwarder.git"
+  },
+  "keywords": [
+    "child_processs",
+    "spawn",
+    "error",
+    "stdout",
+    "stderr"
+  ],
+  "author": "Ben Drucker <bvdrucker@gmail.com> (http://bendrucker.me)",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/bendrucker/spawn-error-forwarder/issues"
+  },
+  "homepage": "https://github.com/bendrucker/spawn-error-forwarder",
+  "devDependencies": {
+    "chai": "~1.10.0"
+  }
+}

node_modules/spawn-error-forwarder/src/index.js

@@ -0,0 +1,22 @@
+'use strict';
+
+function createErr (code, stderr) {
+  return new Error(stderr);
+}
+
+module.exports = function (child, errFactory) {
+  errFactory = errFactory || createErr;
+  var stderr = [];
+  child.stderr.on('data', function (chunk) {
+    stderr.push(chunk);
+  });
+  child.on('close', function (code) {
+    if (code !== 0) {
+      child.stdout.emit('error', errFactory(
+        code,
+        Buffer.concat(stderr).toString()
+      ));
+    }
+  });
+  return child;
+};