The main interface filename must be the same as the directory its in:
<intefaces>
	<ListMenu>
		ListMenu.py
	<WheelMenu>
		WheelMenu.py

Class name must be 'Interface' and be a subclass of clutter.Group
__init__ function takes form (self, glossMgr)

####################################################
#Interfaces require the following to be implemented:
####################################################
Global Variables:
- usePreviewEffects (Bool) = Whether or not the modules should use preview effects
Class Name = Interface
- addItem(label)
- display()
- getItem(index)
	- Returns the menu item identified by index
- selectNext()
- selectPrevious()
- selectFirst()
- get_current_item()
	- Returns the currently selected item
	
#####################################################
HIGHLY RECOMMENDED:
Implement the inputQueue mgr with the following:

#Setup input queue controller
self.input_queue = InputQueue()
self.input_queue.set_action(InputQueue.NORTH, self.selectPrevious)
self.input_queue.set_action(InputQueue.SOUTH, self.selectNext)