Add integration tests

Created by: marekweb

Add integration test for a repository index page.

• load a repository page on Sourcegraph
• assert that it loads and shows directory listing
• navigate to a file, assert that it works
• navigate back to repository using breadcrumbs
• navigate to a commit, assert that it works

Add a short test for user profile

• load user profile
• change display name and click save
• assert that updateUser request is triggered