Put node directory in PATH when spawning

This ensures the node used by the spawned process is the one bundled
with Atom.

This should prevent any "env: node: No such file or directory"
errors when spawning a node bin script such as nak.

Refs #514

src/stdlib/buffered-process.coffee

@@ -1,4 +1,6 @@
 ChildProcess = require 'child_process'
+path = require 'path'
+_ = require 'underscore'
 
 module.exports =
 class BufferedProcess
@@ -6,6 +8,8 @@ class BufferedProcess
   killed: false
 
   constructor: ({command, args, options, stdout, stderr, exit}={}) ->
+    options ?= {}
+    @addNodeDirectoryToPath(options)
     @process = ChildProcess.spawn(command, args, options)
 
     stdoutClosed = true
@@ -36,6 +40,14 @@ class BufferedProcess
         processExited = true
         triggerExitCallback()
 
+  addNodeDirectoryToPath: (options) ->
+    options.env ?= process.env
+    pathSegments = []
+    nodeDirectoryPath = path.resolve(process.execPath, '..', '..', '..', '..', 'Resources')
+    pathSegments.push(nodeDirectoryPath)
+    pathSegments.push(options.env.PATH) if options.env.PATH
+    options.env = _.extend({}, options.env, PATH: pathSegments.join(path.delimiter))
+
   bufferStream: (stream, onLines, onDone) ->
     stream.setEncoding('utf8')
     buffered = ''