Changes the app theme in the AndroidManifest
Adds icons to ActionBar
Renames "menu" to "menu_main"
Makes MemoriesListFragment controls action buttons on the action bar
Makes MainActivity handle clicks on ActionBar itens
Externalizes strings on menu_main
Removes "save" button from MemoryViewerFragment.

Moves the save action to the ActionBar
Fixes padding in the MainActivity

Now the memory list will scroll to below the ActionBar, as proposed by the Android Developers page on http://goo.gl/w8Uien