Added crouton library, moved menu to /res/menu, removed menu and spinner from LoginAction.
Design changes.

Removed top and bottom padding from list_main_layout and added bottom
padding to lesson_row; the list now fills the screen.
Added logout menu item, disabled settings menu item.
Disabled actionbar list navigation as other views are not implemented
yet.
Set the drop shadow a little darker.
Replace unknown data with question marks.
Edited colors.