user edits a proof and sees updated proof on /users/:id

@adamico I can't seem to get over this error. I feel it has something to do with how I code the users and proofs controller but I'm not entirely sure. 

```
Failures:

  1) Manage proofs user edits a proof
     Failure/Error: click_link 'Edit proof'
     Capybara::ElementNotFound:
       Unable to find link "Edit proof"
     # ./spec/features/manage_requirements_spec.rb:54:in `block (2 levels) in <top (required)>'

Finished in 0.38941 seconds
6 examples, 1 failure, 2 pending

Failed examples:

rspec ./spec/features/manage_requirements_spec.rb:47 # Manage proofs user edits a proof
```