Added implementation for Xbox Controller
Added back snap to value on drive joystick
Fixed Snapping and adjusted driving speeds

-Fixed snapping to work with the logitech controller
-Changed button names so any name ending with an X belongs to the xbox
controller
-Added ability to hold the right bumper on the logitech to cut down the
speed for fine adjustment
-cut rotation speed in half
Merge branch 'Colin' of http://github.com/Nashoba-Robotics/Nashoba-Robotics2013 into alex