Adding VotingRight model. steps towards #22

- only allow users with voting rights to vote/create ideas
- expects at least one VotingRight attribute on IdeaThread creation
- association for IdeaThread.voters
endpoint for user_search
include voting_rights in idea_thread json
fix display_name spacing
adding VotingRightsController with detroy and show actions
adding create action to VotingRightController
fix routes for voting_rights
typo in ideas_controller.
fix votes_controller tests.
Merge branch 'master' into teams-22-rb

Conflicts:
	app/controllers/ideas_controller.rb
don't send signature to client
Merge branch 'master' into teams-22-rb

Conflicts:
	app/controllers/ideas_controller.rb
Merge pull request #27 from cremalab/teams-22-rb

Voting Rights and Teams