Set deployment target to 5.0

LBYouTubeExtractor uses NSJSONSerialization which was introduced in iOS 5.0
Remove ivars and @synthsize
Use weak instead of unsafe_unretained
App delegate cleanup
Set indentation settings to 4 spaces
Remove dealloc

The dealloc method can not be called if _closeConnection has not been called first since NSURLConnection retains its delegate
Delete forward method declarations
Simplify LBYouTubeExtractor initialization
Simplify LBYouTubePlayerController initialization
Simplify calls to LBYouTubePlayerController delegate
Delete unused _startConnection method
Make the unescapeString method a static function
Remove underscores from method names

Underscores in method names are reserved for Apple
Merge pull request #52 from 0xced/modernize

Modernize