Added ColorEightByEight class and example program for Adafruit Bicolor LED Square Pixel Matrix with I2C Backpack

Added note about possible pixel indexing bug in the non-color version.  I don't have the non-color version to test with.

Added note about possible unintentional color "blending" bug in the Arduino color version.
(borked previous commit, probably will again..)

Added ColorEightByEight class and example program for Adafruit Bicolor LED Square Pixel Matrix with I2C Backpack

Added note about possible pixel indexing bug in the non-color version.  I don't have the non-color version to test with.

Added note about possible unintentional color "blending" bug in the Arduino color version.
oops fixed collision on busnum - lets have it only set in the i2c file eh?
fixed up buttonPrssed() function - much nicer now!
test sketch
whew, fixed busnum thingy, also cleaned up global mcp
Fixed MCP23008 registers
Fixed MCP23008 registers
Added note about selecting I2C bus
fixed bad whitespace
first commit for VCNL4000 code
Added basic ADS1115 support
Update Adafruit_MCP230xx/Adafruit_MCP230xx.py

removed unreachable code
Ported LCD createChar() method from Arduino lib
Manual merge of changes from bbkiwi
Incorporating nmadura's BeagleBone changes
Broad changes to I2C, MCP320XX, CharLCDPlate (faster)
Bugfixlets & moar speed
Further speed tweak; poll only when sensible
Eliminated separate poll flag and partial strobe op.