maybe merge with my fork?

[Jorgen-VikingGod]

Hi Aaron,
I decided to add/merge some multi-tiled-matrix functionallity to your sources:
https://github.com/Jorgen-VikingGod/LEDMatrix
Add additional graphics library on top of the cLEDMatrix class and add some travis builds.

First I only did a FastLED port of the Adafruit_NeoMatrix;
but then I realized that I can not use your awesome sprite class with it.
So in the second step I did a fork of your awesome cLEDMatrix class and merge some Adafruit_NeoMatrix and Adafruit_GFX library functionallity into it.

Now it builds and works fine on my 4 LED matrix panels.

Only some methods are not finished ported yet (ShiftLeft, ShiftUp,...)
I want to do this next week - or, you do have some time to do this?

So if you like the idea, feel free to merge.