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:

- [ ] update the installs view to be less nutso
- [x] get the feature spec passing

Trello card: https://trello.com/c/l7YoGfzK
Could you just do?

```
current_user.update_install_preference(preference_params)
```