when missing a valid session, redirect to requested page after login

(issue was in wrong project)

fixes Graylog2/graylog2-server#440
redirect(null), I nulled.

fixes Graylog2/graylog2-server#440
Node details - heap not updated

only simple html fixes

fixes #664
fix unused test
Merge git://github.com/Graylog2/graylog2-web-interface into develop