[https://trello.com/c/mDDc5kpd/55-2-propose-a-badge]

* Creates join table for users and propose badges
* Adds fabricator for propose badges
* Adds specs for propose badges model
* Adds specs for propose badges controller
* Fix specs for users model
* Fix typo in nominee_users controller spec
[https://trello.com/c/mDDc5kpd/55-2-propose-a-badge]

* Adds create method functionality for propose badges controller
* Fix relationships in propose badge and user models
* Adds checkboxes for propose badges new view
[https://trello.com/c/mDDc5kpd/55-2-propose-a-badge]

* Remove jquery-ui gem
* Remove unnecesary js files