Removed nonfunctional listener for cmd+. Adding it to the menu as a shortcut works on its own.
Added logout function.
Enable/disable login/logout menu items.
Merge pull request #21 from Zarkonnen/prefs_shortcut_cleanup

Prefs shortcut cleanup
Merge pull request #22 from Zarkonnen/login_logout

Login & logout
Merge pull request #2 from saucelabs/master

Updating zarkonnen