Demo4 changes, demos using old Surface.

-Rolled the demos back to using the old pygame surface for now.
-Demo4 has been changed to be a little cleaner. It now accepts csv files of correct and incorrect filepaths to load.
	for now they are displayed randomly, but another version that will accept two arbitrary pairings is in the works.
	Another version where permutations can be generated by inputing criteria (eg. 'blue and star' 'green or circle') is also on the way.

	-mm