sqlalchemy gives autoloading (hopefully caching) link to
other objects as properties. So turn get_uploader on the
current mongo based stuff into a property to ease
transition.
The .uploader() method conflicts with the uploader database
field. As we're moving to .FIELD for db field access, this
is a relevant conflict.
So renaming .uploader() to .get_uploader()
* Removed trailing whitespace
* Line length < 80 where possible
* Honor conventions on number of blank lines
* Honor conventions about spaces around :, =