Removed handles for moving objects and disabled rotation tool as a test.

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
Added cheat sheet.

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
Minor changes to OS X cheat sheet.
Reduced alpha of selection bounds.
Show move indicators while moving objects around.
Improved stability when determining the positions of vertices after they have been moved.