Revert "pass db instance instead of a database name to gridfs"
Revert "pass db instance instead of a database name to gridfs"

This reverts commit bcd6edc636585e5a46b9ea0796b2aff61122b2b4.

sunlightlabs/sunlightlive,sunlightlabs/datajam,sunlightlabs/datajam,sunlightlabs/sunlightlive,sunlightlabs/datajam