Updated project settings for Xcode 5 & introduced asset catalogs
Organised ASIHTTPRequest files into lib subdirectory
Fixed implicit file references for all files in libs.
Added missing retina slots for all image assets.
Migrated iTunesArtwork to asset catalog.
Moved and renamed project info.plist file.
Unlinked GameKit framework due to lack of code signing support.
Updated .gitignore
Removed erroneous header files from compile sources directive
Changed built product name to "AppMaker".
Added a class prefix "AM" to default project settings
Added generic code signing identity.
Merge pull request #3 from ttton/cleanup

Project cleanup and modernisation.