Add user profile photos, use in show schedule

[bentsherman]

The old private website allowed each user to upload a profile photo, but this feature hasn't been implemented yet in the current private website. The client-side interface is pretty straightforward with ng-file-upload, but the server API for updating a user profile needs to be able to read, validate, and save an uploaded image to the server's file-system.

Once this feature is implemented, it can replace the random image that is used in the show schedule on the public website. Maybe use the WSBF lady as the default instead.