tweak compose activity action bar
change launcher icon
remove unused materials
improve activities' action bar ui
implement home button up navigation for detailed view
fix pull-to-refresh and clean up debug code
replace universal-image-loader with Picasso; update v4 support version
migrate from sherlock to v7 support
remove unused files
User can switch between Timeline and Mention views using tabs.
  a) User can view their home timeline tweets.
  b) User can view the recent mentions of their username.
     (i) TOFIX: pull-to-refresh get the same tweet
  c) User can scroll to bottom of either of these lists and new tweets will load ("infinite scroll")
  d) User can pull to refresh in home timeline.
working user profile
working profile view for all users
added home as back button for profile view
reply to tweet
add progress bar and improve profile view ui
some more ui changes for actionb ar
trying out simple card ui for list item
remove commented out code
remove margin
testing view pager