Elevon Functionality

[mikejr83]

Build functionality to enable the rotating of the modules by 90 degrees so that the modules rudder is now horizontal. This orientation would now make the modules' rudders into elevators.

When this functionality is enabled the user should be able to use the modules as elevators or elevons. When functioning as elevators both modules should move their rudders up in down in sync (by the same amount). If the user enables elevon mode the phone should then use the roll and pitch of the device to set the rudder of each module up or down according to the roll and pitch percentage.

See elevon definition: http://en.wikipedia.org/wiki/Elevon