Merge pull request #7 from ryandevore/master

Added UIImageView category for remote image loading
Adding UIColor extensions
- Removing UIImage functions from UUDataCache.
- Implementing objectForKey and setObject:forKey functions in order to use UUDataCache as an NSCache or NSMutableDictionary replacement
- Changing UUImageView to have a "settable" image cache. If you don't set it, it defaults to the UUDataCache