Redirection after Login and Register added

After successful login or register the user is redirected to the
UserActivity
UserActivity made into PagerView

I've created Pager Adapter for the UserActivity. The adapter manages 4
fragments (ProfileFragment, MessagesFragment, ConnectionsFragment,
PostsFragment). These fragments are still empty. I will start to put
content in them.

I've also went to android.support.v4.app. Changed all of the Activities
to extend FragmentActivity. This was I will make my app to support alder
android versions