fix link to background image
Merge pull request #4289 from rivendale2010/patch-2

fix link to background image
Change devise config and templates to make logout a delete request.
Merge pull request #4309 from jflemingprod/feature/4068-logout-delete-request

Log out should be a DELETE request
Move facebox configuration into the initialization of the Backbone app

Facebox is already called from some Backbone views very early, making its icons 404 otherwise.
Merge branch 'develop' of https://github.com/diaspora/diaspora into develop