Make success reset the scenario for now.
Get rid of the success and failure clauses, and replace them with
triggers.

Conflicts:
	index.vwf.yaml
	source/scenario1.vwf.yaml
Fix it so that each trigger has its own set of actions, instead of
storing them on the prototype.
Merge pull request #106 from virtual-world-framework/triggers

Triggers
Add show/hide functions for comms display
Add actions in the model to show/hide comms display
Add event listeners for comm display
Add placeholder VO playing clause