first version of the side menu. This is a draft, but basically will look something like that
adding ui_context mechanism (not used at the moment), added card_background for the main-fragment to notify when the IME is not default
applying a new gplus icon
title change for the main fragment
adding new PrefernceFragment, and fixing the drawer navigation. onBackPressed is fixed too now.
updating menu data on config change
updating prefernce styles and assets
updating styles a bit
adding a new SEARCH-PLAY-STORE view