Add loading animation.

Modify also the main layout (Linear -> Relative layout) for a better
organization of the UI.
Move cursor parsing in StatisticMap.
Reorganize data loading code.

Since we can't use directly the Cursor is pointless to use the Loader
stuffs, change code to use Asynctask.
Close cursor.
Merge branch 'loading-animations'
Bump to revision v1.2.0