Add isFastBoot property to service

Author: David Pett

app/services/fastboot.js

@@ -9,7 +9,7 @@ export default Ember.Service.extend({
   host: computed(function() {
     return this._fastbootInfo.host();
   }),
-  isFastboot: computed(function() {
+  isFastBoot: computed(function() {
     return typeof window.document === 'undefined';
   })
 });