LIB: removed app_name to prevent issues with Manifest Merger
Prepared 1.7.3
Merge branches 'dev' and 'master' of https://github.com/gabrielemariotti/cardslib into dev
LIB: added doc for SectionedCardList
LIB: fixed doc for SectionedCardList
Keep mInternalObjects in sync for CardArrayAdapter

If setEnableUndo is set to true, CardArrayAdapter
tracks the Cards in the underlying array in a HashMap,
mInternalObjects. If ArrayAdapter methods add, addAll, or insert
are used to manipulate the array, mInternalObjects was not updated.
So, the undo functionality would fail for any Cards added to the
adapter in this way. Fixed this by tracking any changes to the adapter
and reflecting this in mInternalObjects, keeping the HashMap in sync.