Includes Hydra::ModelMixins::RightsMetadata on the nu_file module so that we can call .permissions on an instance of a NuFile and get back a hash of who can read/edit it.  Tests were failing w.out this and I can't see why we wouldn't want it.
The title of the root collection for a user personal's repository is now their full name, instead of 'User Root'.  Fixes #310