Revision 1.11 control changes.

This is still having to be done after the revision commit is made to get the correct commit hash for the revision name to match the control.
Update to Pronterface UI.

Updated source and image files for the Pronterface UI. The Extruder controls have been simplified and labeled. The Y axis controls have been flipped to match the motion of the bed. Z controls are also now labeled up and down. Celcius was added to the temperature control.