Allow browsing and filtering all relationships instead of just
followers, unify the codebase with the user-facing relationship
manager, add ability to see who the user invited
* Fix unused role routes being generated
* Remove unused JavaScript code
* Refactor filters code to be DRYer
* Fix `.count == 0` comparisons to `.empty?` in views
* Fix filters in views
Takeshi Umeda
Eugen Rochko