Added PagerSlidingTabStrip library.
Update android support library to v19.0.1.
Added achartengine-1.1.0 lib. Implemented a simple pie char view
Implemented a simple version of mind map fragment.
Renamed the previous tab style activity as MainActivityLegacy.
Implemented first version of main ui with navigation drawer.

Known bugs: After critiques item list is not properly redrawn.