Giving User the ability to remove themselves from an IdeaThread

Dependent on https://github.com/cremalab/suite_api/pull/117

Clicking "remove myself" will destroy the associated VotingRight, delete that user's votes in any idea, and remove the IdeaThread from their view.

**Note**: Unbinding `VotingRight#destroy` from its `remove` event and instead just calling `destroy` on the model from the view.