Upgrade to Xcode 6 recommended settings
Add default "XCDYouTubeKit iOS Framework" target

Also rename "XCDYouTubeKit iOS" into "XCDYouTubeKit iOS Static Library"
Cleanup versions settings

Use settings defined at the project level instead, they are shared between the iOS and OS X frameworks targets.
Cleanup "Deployment" settings
Cleanup "Linking" settings
Cleanup "Apple LLVM 6.0 - Code Generation" settings
Cleanup "Apple LLVM 6.0 - Preprocessing" settings
Cleanup warnings settings
Cleanup "Apple LLVM 6.0 - Language - C++" settings
Fill "Compile Sources", "Link Binary With Libraries" and "Headers" build phases
Disable auto import warning to fix iOS framework compilation
Use the iOS framework instead of the static library in the demo app
Update `XCDYouTubeKit iOS Static Library` scheme name for Travis
Delete duplicate XCDYouTubeKit group entry
Replace TRVSMonitor with Xcode 6 builtin asynchronous testing
Ignore designated initializers warning when compiling VCROrderedMutableDictionary
Add LaunchScreen xib to support iPhone 6 and 6+
Merge branch 'feature/xcode6' into develop