[#1155] Document how to upgrade the dependencies
[#1068] Show 404 instead of login page on user not found

Remove unnecessary auth check, fix redirect
[#1155] Tweak upgrading dependencies docs
Merge branch 'master' of github.com:okfn/ckan into 1155-document-upgrading-dependencies
[#1155] Explain how to pin the latest uncompatible version in requirements.in
[#1155] Add a small clarification to the docs
Merge branch '1155-document-upgrading-dependencies'
Merge pull request #1068 from okfn/1068-404-on-user-not-found

Non-existent user profile should give error