Put users views into UserController.

Public user pages are rendered by show, the private home page of
the logged in user by me.

A temporary header is shown on the pages with controls for log in, log
out and going to the home page. This should move to the layout eventually.
Public user page should be accessible without login.
Merge branch 'master' of github.com:SUSE/hackweek
Remember page which required login.

This only works because CSRF protection is disabled for the Omniauth
callback, otherwise is the session lost, where the URL to return to
is stored. It would be nice to have a better solution.
Merge branch 'master' of github.com:SUSE/hackweek

Conflicts:
	app/controllers/home_controller.rb