Added basic data model for events.
Added first version of data model for events.
A minor tweak to the data model.
A few changes to the event data model:
	- added a main image for the event, to be stored as a URL.
	- cleaned up the responses, responses can be a comment an image.
	- added location information to the event.
Added logic test target for building data models.
Merge pull request #12 from mdewolfe/FEATURE_models

Feature models