Added Transitions and minor code clean up

Added support for the DetailView Activity
transition. The DetailView can now be started
from the launcher or the Cards example.

Added support for Browse entrance transition.

Minor code clean up such as renaming
GridExample fragment to GridExampleFragment
and removing unused methods.

Change-Id: Ib1c11af82be5b858960e243acd7f11ce8dbd06f7
16 files changed