Export Atom's version of React and Reactionary

Fixes atom#3101 and works around facebook/react#1939.

Author: dmnd

exports/atom.coffee

@@ -25,3 +25,5 @@ unless process.env.ATOM_SHELL_INTERNAL_RUN_AS_NODE
   module.exports.View = View
   module.exports.WorkspaceView = require '../src/workspace-view'
   module.exports.Workspace = require '../src/workspace'
+  module.exports.React = require 'react-atom-fork'
+  module.exports.Reactionary = require 'reactionary-atom-fork'