Added MAX7219 pin information to the source files
Renamed the library to avoid name collisions.

The library has been renamed to ICMIMax7219 so that multiple MAX7219
libraries cann be installed in the Arduino IDE at the same time without a
collision of the names of the header files.
The example sketch has been updated accordingly.
Converted README to Markdown syntax
Renamed file for github to show pretty version
Moved initialization into dedicated begin() method

In order to enable the user to do the configuration of the library
independently of the variable declaration, the initialization routine has
been moved from the constructor into a dedicated begin() methods.
Merge pull request #1 from hmbusch/dev

Merge develop state into master