Push Notifications Working Perfectly

Finished Tasks:
 - Adding a new library file —> pushNotificationAPIs.js
 - User friends’ are notified when he updates his profile.
 - Api for notifying a friend when he becomes favourite.
 - Getting device token and setting push notification callback
functions is optimised and enhanced.

Remaining:
 - Sending notification when user becomes favourite.
 - Saving notifications offline so they could be imported in
notification centre.
 - Integration.