Angular Colorpicker

An angular colorpicker for use with angular views. Fashioned after [jQuery Minicolors] (https://github.com/claviska/jquery-miniColors/).
Aha, I thought that quite a glaring error in the previous version. I'm glad to learn that I was wrong.

This function is indeed intended to remove G-Z characters. They aren't a valid part of a hex value, and setting the color equal to `#000Z00` would cause problems when the colour is being transformed from a hex value into a hsb value so that the color selectors can be moved.