Implemented the roller servo.

	modified:   src/argentum/argentum.h
	modified:   src/argentum/commands.cpp
	modified:   src/argentum/commands.h
	modified:   src/util/rollers.cpp
	modified:   src/util/rollers.h
Update rollers.h

Trivial formating of a line.
Update rollers.cpp

Added some comments, commented out some debugging messages, and fixed some formatting.
Update commands.cpp

Commented out some debugging code and fix some formatting.
Merge pull request #18 from terrylm/develop

Implementation of rollers.