switching created_at to time_or_post
refactored controller
Refactored Feed Controller
Refactor logic out of Feed Controller and into API service and Post Model
create exception raising api pull, if time since last pull is less than api rate limit
remove logic that post model checks on whether API service has updated the db; instead let api service tell the model when it pull, whether it actually does or not
make Post tell service to pull from api if given a hashtag and then return all
mend
move pulling post from api and sorting out of html request in controller to model
rename method to in service to pull_posts
fix errors caused by refactoring (found after running rails s)
fix failing test
Merge pull request #21 from anirudh-eka/refactor

Refactor: controller no longer talks to service (repushed with rebase)