Flatten src directory

* Move src/app to src/
  * Move src/stdlib to src/
  * Remove src/app and src/stdlib from NODE_PATH

src/buffered-node-process.coffee

@@ -0,0 +1,21 @@
+BufferedProcess = require 'buffered-process'
+path = require 'path'
+
+# Like BufferedProcess, but accepts a node script instead of an executable,
+# on Unix which allows running scripts and executables, this seems unnecessary,
+# but on Windows we have to separate scripts from executables since it doesn't
+# support shebang strings.
+module.exports =
+class BufferedNodeProcess extends BufferedProcess
+  constructor: ({command, args, options, stdout, stderr, exit}) ->
+    args = ['--atom-child_process-fork', command].concat(args)
+    node =
+      if process.platform is 'darwin'
+        # On OS X we use the helper process to run script, because it doesn't
+        # create an icon on the Dock.
+        path.resolve(process.resourcesPath, '..', 'Frameworks',
+                     'Atom Helper.app', 'Contents', 'MacOS', 'Atom Helper')
+      else
+        process.execPath
+
+    super({command: node, args, options, stdout, stderr, exit})