When a project is moved and being accessed by the old full path
our API returns 404. However, we should redirect user to the
existing link.

This commit:

- When request is GET, finds a project and takes redirect
routes into account
- If the specified full path is not equal to the current
full path, 301 (Moved permanently) is returned with Location
set as a header
- The Location header contains the new url that specifies id

Changelog: fixed