+ added link to the youtube clip
 * refined the text
 + added saving and loading of simulations
 * updated start screen with new key bindings
Merge remote-tracking branch 'origin/master'

Conflicts:
	Sugarscape/v2/util/sc_io_handler.py
Merge remote-tracking branch 'origin/master'

Conflicts:
	Sugarscape/v2/util/sc_io_handler.py