Fixed an bug with mouse events that prevented parent elements from
receiving them.
#28: Fixed a bug with specific state listeners
Fixed the name of the LightedStyle domain
#24: Fixed a problem that prevented re-renders when applicable
style-sheet attributes changed due to state changes.
#6: Fixed for a recent change to state engine listeners
#6: Changed the default button styles
#6: Modified the model to change the background of the whole MUIS body
when the button is clicked, just to show that it can do stuff.
#37, #6: Added the MuisActionEvent class to represent action events
instead of just propagating the raw user event.  This allows methods
that could receive events from multiple actions to inspect which action
actually occurred, and could allow other information later.
Added "the" to the list of accepted prefixes for fields
#6: Added key listeners to spark the action (space and enter only)