add tags to vote and bill api, and allow filtering by tag for votes
bug fixes in last commit
WIP. add vote auto tag method. currently only prints matches. needs tuning and performance improvements
add migration for suggested by field, and auto_now_add
add tag keyphrase model
tag keyphrase for auto tagging
Added tastypie-swagger module, initial swagger support

Swagger is accessible under the /api/v2/doc/ endpoint