Fix for repr and add unit test for event

Face of cube is always an integer and entityId should always be discrete integer
So use :d instead of :2f

Add unit test of event.py
Rename to indicate unittest form
Remove runner code
Change evnt to event and remove setUp/teardown
Revert event repr to previous and test

revert to previous style of repr
Add test for original event
Delete unittest style test

To be replaced by a py.test style file
Add file for py.test style tests
Merge pull request #28 from hashbangstudio/event-update

Fix for repr and add unit test for event