Added Post and comment models

Made changes from initial implementation we had set up in light
of the contents of example-article.json. All changes are documented
within the code, so the reason for each field being where is
justified
Merge branch 'master' of https://github.com/Solanar/CMPUT410-Project into fillOutModels

Conflicts:
	DisSoNet/data/admin.py
	DisSoNet/data/models.py