Addition of LEDs and Flipping the Print over the X-Axis

This pull request introduces the following two features
1. Custom G-Code commands and pin defintions for the activation and deactivation of 3 LEDs
2. Flips the print over the X-Axis

Item number 1 above was necessary because 
The lines below actually execute the turning ON and OFF of the LEDs.

I realize this is not the most efficient way to perform this actual, however this method is simple and works and will be used for now.