Notifications support

Added Notification support as requested in http://community.topcoder.com/tc?module=ProjectDetail&pj=30042585
- Updated baseCtrl.js to support notifications for phase change 
- Updated messageArenaCtrl.js to support real data for notifications
- Updated notificationService in factories.js to support real data
- Updated resolvers.js to handle different broadcasts
- Updated helper.js with constants to support notifications