Removed refresh_bundles() method and re-enabled is_float() method
added refresh_user_bundle() method and removed is_float() method. now it imports from helpers.py
updated refresh_bundles to Bundle.refresh_user_bundles command in various places
Adding / Removing issue from users pull list in the api now updates the user's current bundle as well.
Bundle model now can update user models. is_float() method is now in
the helpers.py file as I cleared up a circular importing issue with
comics.models.py

Merge branch 'feature/bundle_fix' into develop