add user has_many nodes association and spec
add tag model, migration, and specs
add story to tags association and join table
fix tag model typo
add Star model, migration, and specs
add Star associations for story, users, plus specs
schema change
resolve merge conflicts
resolve merge conflicts
Merge branch 'tagging' of github.com:purple-martins-2013/storyward
Merge branch 'user_starred_stories' of github.com:purple-martins-2013/storyward
merge master into stories