added libgit2/objective-git library as submodule
update gitignore
remove iOS7 deployment targets + submodule fix
update to always choose latest sdk
remove objective-git submodule
Merge branch 'master' of github.com:Catrobat/Catty into issue#360

# By Marc Slavec (12) and Ralph Samer (11)
# Via Ralph Samer (7) and others
* 'master' of github.com:Catrobat/Catty: (23 commits)
  ScriptViewController UI changes
  new approved launch Screen
  new xib at launch
  remove ios7 targets + update schemes
  some small UI changes
  new height/width variable brickCells
  fixed some hardcoded stuff
  fixed SlideMenu + ProgramDetail for iPhone6
  fixes CatrobatTableView and DownloadSegmentedControl for iPhone6
  fix for after-download-renaming issue
  fixes #378
  fixes navigationBarHidden after swiping back
  fixes delayed NavigationBar
  new introView for iOS8
  search iOS8
  restore My First Program archive
  fix compile errors
  added schema for current catrobat language version
  fix description parser issue
  remove unused storyboard backups
  ...

Conflicts:
	src/Catty.xcodeproj/project.pbxproj
	src/Catty.xcodeproj/xcshareddata/xcschemes/Catty.xcscheme
	src/Catty.xcodeproj/xcshareddata/xcschemes/LicenseTest.xcscheme
	src/Catty/CatrobatTableViewController.m
fix merge conflicts
fix merge conflicts that caused compiler errors
remove objective-git submodule + comment setup guide for objective-git
Merge pull request #388 from Catrobat/issue#360

configuration for objective-git submodule