Added support library for fragment access

Signed-off-by: Bartol Karuza <bartol.karuza@klm.com>
Abstracted away the AndroidApplication to allow alternatives to activity base classes.

Signed-off-by: Bartol Karuza <bartol.karuza@klm.com>
Fragment base class for AndroidGraphicsApplication

Signed-off-by: Bartol Karuza <bartol.karuza@klm.com>
Renamed AndroidGraphicsApplication to AndroidApplicationBase

Signed-off-by: Bartol Karuza <bartol.karuza@klm.com>
Fixed ClassCastException in AndroidGraphics, removed the hard dependency on AndroidApplication
merged fragment pr
Merge branch 'master' of https://github.com/libgdx/libgdx