Merge pull request #11 from rwldrn/10

Harden runtime check via process [[Class]] string. Closes gh-10

lib/rsvp.js

@@ -5,7 +5,8 @@ var browserGlobal = (typeof window !== 'undefined') ? window : {};
 var MutationObserver = browserGlobal.MutationObserver || browserGlobal.WebKitMutationObserver;
 var async;
 
-if (typeof process !== 'undefined') {
+if (typeof process !== 'undefined' &&
+  {}.toString.call(process) === '[object process]') {
   async = function(callback, binding) {
     process.nextTick(function() {
       callback.call(binding);