Adds support for common-anode tri-color LEDs

The LEDs from Adafruit are common-anode, and need all of the inputs swapped.  This also cleans up some formatting and doesn't re-instantiate the j5 led variables in each interval, to stop the flickering.
Merge pull request #4 from mnutt/common-anode

Adds support for common-anode tri-color LEDs