Updated models and migratiosn to include categories and pairs
Merge pull request #3 from bobolinks-2014/setup

Updated models and migratiosn to include categories and pairs
fixed article_tags and tags migration files
Added initial seed file
Added seed file
changed some models names and still working on the category methods
Merge pull request #5 from bobolinks-2014/pairing-articles

Pairing articles
Merge branch 'master' of https://github.com/bobolinks-2014/FlipSide
Merge branch 'master' of https://github.com/bobolinks-2014/FlipSide into seed_file
pair to pairs
merge fix
merged