Change app icon
Improve Login Screen

- Remove unused actionbar.
- Add a new Background image
- Move all undesity images to a drawable folder
- round a bit login button
Create an app theme

- Theme style
- Proper icon logo
Redesign timeline

- Add "card"-like style for tweet items.
Card UI to other views
Change icons for-real
Make twitter logo density aware
Create a Fragment layout for the timeline
Switch activity timeline to use fragment layout
Implement Home Timeline as a fragment

- Create base TweetsListFragment
- Create a HomeTimelineFragment that extends the above
- Move relevant logic to base fragment and out of the activity
Support fetching mentions
Implement initial Mentions Fragment
Add a FragmentTabListener to add support for tabs
Add tabs for Home and Mentions tweets.

- Users can switch between timeline and mentions views using tabs
Merge branch 'fragments' into dev
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
Fix UI position for name/screename