Added in the DigiPixel libraries folder and a few other additions

Brad,

It took me a bit to find the library you had shared in the 23Feb archive, so I thought I'd help out others and add them into this github repo.  I also added a simple README with some hopefully relevant info and links to your other demo videos, etc.  Hope this helps!  Thanks for the bits and the pixels!

I wasn't certain if you wanted to add the other files to the github as well, so I left them out for now.  Also, we might want to follow the Arduino template and stick all the examples in an examples/ subfolder.  Then when someone imports the library they'd get them in the IDE menu?  Up to you..

- Added in the DigiPixel libraries folder
- Moved a couple of new demos to named subdirectories
- Added a main README.md, taking some liberties with content from Brad's site to get it started