Merge branch 'master' into fix-logging-out-bug-7
Add Devise override for sign out path.
Add HTML format response to SessionController.
Add GET route to destroy Devise session.

The primary reason for doing this is to allow log out using simple
HTML links.
Use full-page reload when logging out.
Merge pull request #15 from vitaliyg/fix-logging-out-bug-7

Fix logging out bug 7