Improved remote test_visualize

Made improvements to the interface for test_visualize (added text rendering to render scale labels, now UP/DOWN modifies the scale of the vertical axis)

Also changed Drive::calculateOrientation() to test usage of atan2().
Merge branch 'master' of https://github.com/quadcopter5/quadcopter

Conflicts:
	quadcopter/src/drive.cpp
	quadcopter/tests/visualize/Makefile
	quadcopter/tests/visualize/test_visualizedrive.cpp