Major refactoring of color_sensor.
Major refactoring of color_sensor.

- Color sensing functions now use one function, which takes args for each
  color, instead of seperate function for each color.
- Added watch_for_color() function. Returns when color is found.
- Made all functions pep8 compliant.

deepakiam/bot,deepakiam/bot,IEEERobotics/bot,deepakiam/bot,IEEERobotics/bot,IEEERobotics/bot