Add tests

[sdgandhi]

Unit testing!

• Array+Utils
• CGPoint+Utils
• CGRect+Utils
• CGSize+Utils
• Dictionary+Utils
• Double+Utils
• NSData+Utils
• NSDate+Utils
• NSObject+Utils
• NSRegularExpression+Utils
• NSString+Utils
• NSTimer+Utils
• Range+Utils
• UIColor+Utils
• UIImage+Utils
• Math
• Threading

[jhurliman]

Updated with TODO list

[jhurliman]

Swift 2 needs to get here faster. 1/3 of the methods in this library can't be marked public yet, some of the methods are unnecessarily tied to specific types (Double+Utils instead of FloatingPointType+Utils), and some things just can't be implemented without protocol extensions like each/map/filter/etc for SequenceType.