Added RiakCS Support

Fixes issue #1100 

This is my first DD check, please feel free to speak of it harshly.

Tested in Centos 6.5 so far.
I checked some other modules, I think we just want it to log errors, not necessarily throw events, like a few other checks I looked at, so I reworked it to use "self.warnings" and "self.log.*". Open to thoughts.