Persist install selection

:fork_and_knife: 

When a signed in user clicks the install instructions for a cookbook, persist their selection on their account.

todo:

- [x] update the installs view to be less nutso
- [x] get the feature spec passing

Trello card: https://trello.com/c/l7YoGfzK
Whoops just caught this, should be `POST #update_install_preference`.