added LED brightness sensing

This is to be tied into aaron's stepper motor
added documentation for LED sensor
Flipped brightness 0-dark 100-bright
Added Processing GUI with sensor readings

Updated readme, flipped brightness value to 0-dark 100-bright.
readme cleanup
Merge pull request #3 from EpicEmuRobotics/Sam

Merge in Processing GUI, Brightness sensor
Fix to libraries
merged master