Non-working LED sensor module.

Putting on the back burner until I can get the shift register working to give me a readout.
Working LED light sensor!
Code cleanup, round 1

Moved the new display functions into the shift register "class".
Utilize a 5 sample average - may reduce flicker.
Moved some pin assignments into pindefs.h
Cleaned up comments, attributed source.
Library-ized.

This is the working implementation of the LEDsensor "library"
Merge branch 'LEDsensor'