added sliding menu as a submodule
added SlidingMenu to dependecies
implemented library dependecies
introduced the first version of SlidingMenu instead of MainActivity dasboard
updated .gitmodules to work with my fork of SlidingMenu (it supports ActionBarSherlock)
merge with master
implemented sliding menu as a list of items
removed settings from sliding menu
adapted offset for sliding menu
Merge branch 'master' of github.com:Catrobat/Catroid into sliding_menu
added sliding menu hiding on item click
switched to ProjectsList/SpritesList fragments instead of Activities, refactoring
removed commented layout
added separator for sliding menu list
Merge branch 'master' of github.com:Catrobat/Catroid into sliding_menu