Including "avr/pgmspace.h" in ColorLCDShield.h

Recent progmemify changes require this header file which isn't included
by default with Arduino sketches.
Added ability to print bitmap

I have added the ability to print monochrome bitmaps using the
printBMP(char[2048]) function, wich allows for bitmaps up to 128 by 128
to be displayed on the screen.
Changing constant pin names to be more unique

The similarly named "SCK_PIN" was creating a naming conflict with the SD
library. All better now.
Merge pull request #14 from jacobsax/master

Added ability to print bitmap
Merge pull request #1 from sparkfun/master

Merge updates from sparkfun:master into McNeight:master