Add profile, account, university, and project image support

[rjaltman]

A fair amount of our current designs are centered around having some sort of logo, or associated information for a University, profile, or project itself. Right now, we are using temporary resources to handle all of this, but we should look into image hosting (e.g. via AWS), image linking, or some sort of module that will allow for image management and linking. This may require a modification to the database, using a new attribute that holds a string to a URI resource.