Selectable colors with bitmap replacement, and a new bus!

Selectable colors with bitmap replacement, and a new bus!

 * Added user settings with Clay (https://github.com/pebble/clay)
 * The default background is now b/w, with color replacement on runtime
   based on what was selected in settings. yay user-customization (and
   https://github.com/rebootsramblings/GBitmap-Colour-Palette-Manipulator)
 * Disabled the text portion (for now) since it gets in the way of clock
   face
 * Added a little pixelated bus to go by every so often, user
   configurable frequencies