UIImageColors

iTunes style color fetcher for UIImage and NSImage. It fetches the most dominant and prominent colors. UIImageColorsQuality is a enum with four different qualities. The qualities refer to how much the original image is scaled down. Lowest implies a smaller size and faster performance at the cost of quality colors. High implies a larger size with slower performance with good colors. The highest implies no downscaling and very good colors, but it is very slow.