added question_tags join table
Renamed the QuestionTag model to be singular, updated schema so that Tags no longer had a question_id
Added tag input to creating new posts and displaying multiple new tag objects
fixed merge conflicts
fixed mulitple tag problem so a new tag object isn't created if it already exists
Merge pull request #23 from eisenachalex/reworking_tags_relationships

WIP: added question_tags join table