Merge pull request #20 from ospreys-2014/Constraints

added constraints to migrations, edited User model to check for username...
added factories and test
added factories and test
Merge branch 'baron' of https://github.com/ospreys-2014/Lil-Wayne into baron
changed create entry method to specify user in params
Merge pull request #21 from ospreys-2014/baron

Baron
added user names to posts index view