Generate a set of tags which can be automatically assigned to all assets.

Presently all assets dump into an uncategorized "unassigned" bucket. Let's generate a high level grouping of categorizations for everything using mime-type as well as some directory structure information.

1. Create a collection for assets at the top-level of the repository: eg. (art, resources, 3d_skeletons) replacing underscores with spaces and converting case to be proper names.
2. Automatically assign assets to a collection for the author that originated the asset.
3. Group files by type into collections generally: eg (3d files, 2d files, text files)

While these tags will eventually be useless for working with the system, they will help give an example of the abstract ways in which collections can be used. We should additionally look at creating a few top-level "project" collections manually and assigning assets en masse through the db while we're waiting on the UI for that to be implemented.