Move delete buttons away from the index page onto the edit pages

Also make them red.
Use latest gds-sso
Use released version of simple_form
Ignore spec artifacts
Show travis build status
Merge pull request #7 from alphagov/use-released-version

Use latest gds-sso
Make build green again

This reverts commit 0c2ff8d982d4e6169c978cc75a554364eed03435, which
which broke the build.