URN Config Vars

Use URN instead of Name when creating and reading config variables for asset buckets. looks for a URN based config var before looking for a Name based config var...so things shouldn't break. But, eventually we'll need to convert everyone over to URN base config vars... I've gone through and started converting, but I lost track with the flood of new locations...

https://www.pivotaltracker.com/story/show/78687834