Feature/augmentation api

This is (finally) a functioning implementation of the data augmentation api described in #23 and #30.  It also includes the start of some changes to the property editor to propagate the property url's while loading everything from a single endpoint.  This is all a bit rough around the edges.  Also includes some styling updates from @erimille.

@wamberg, I've been assuming you're unavailable due to the shutdown, but if that isn't the case and you're able to review this, I'd appreciate it.  I'm going to be away until next wednesday, so hopefully that will be resolved by then and we can work on integrating all of this.