Removing any public-facing OpenID options
Outdated as they are, removing openid from unit tests
Removing controller actions and routes
Contains migration! Removing identity_url from the user model
Removing configuration options and gem
Removing now-unused files

Also small cosmetic changes (indentation, syntax etc)
Merge branch 'refs/heads/master' into issue-3280-fire-openid

Conflicts:
	Gemfile

(It was seeing the open id gem as re-added to the Gemfile.)
Merging OpenID branch, resolving Gemfile.lock conflict