Update led-matrix.h to convert to a 16x32 RGB matrix (half 32x32 matrix)
Update led-matrix.cc to convert to a 16x32 RGB matrix (half 32x32 matrix)
Update README.md

Added bit about the purpose of my changes
Update led-matrix.cc
This matrix only needs A, B, & C not D pins

Remove D GPIO pin from mask
Update led-matrix.cc

8 rows in a 0-based array = 0x7
Update led-matrix.h

remove unused FillScreen()
	modified:   Makefile
	modified:   led-matrix.h
	modified:   main.cc
Merge branch 'master' of ssh://github.com/whit2333/rpi-rgb-led-matrix