Update Twitter client getUserTimeline

- method requires a user screenName to pull the user timeline.
 Profile image take you to user profile view

 - ProfileActivity expands to receive user extra args
 - TweetArrayAdapter sets up onProfileImage click listener
 - TweetsListFragment implements the listener.
 - UserTimelineFragment Overrides TweetsListFragment to prevent user from clicking the profile image inside the profile view.
Add profile image click on tweet detail view
Update README
Merge branch 'users-profile' into dev

- Add users profile funcitonality within the app