Implemented show/hide fragment.
Cleaned up and re-arranged code so now the fragment is self-managing.
The options from the menu are handled depending on where they are added.
The menu is built in several steps(Activity+Fragment).
Added icons for the menu options and made the action bar to be shown on the bottom if there is not enough space.
The code is ready to continue.
NEXT STEP: Implement a swipe navigation drawer and move the Movies and Books option there from the option menu.