Add profile icon
Update User Model properties

- Storing: tweetsCount, following, followers
Add getUserTimeline to twitter client
Add Profile Activity

- Add profile icon into menu for timeline activity
- Created a UserTImelineFragment extending TweetsListFragment to show user timeline
- Show user information such as: # of followers, # of following and @ of tweets
Merge branch 'dev' into profile
Merge branch 'profile' into dev