(PDB-47) Enable structured facts from facts terminus

This patch disables the stringify that we perform on outbound facts before
they are sent to the PuppetDB service.

To keep backwards compatibility, for now we are flattening these facts out
to strings before they are stored.

Signed-off-by: Ken Barber <ken@bob.sh>
Merge pull request #1005 from kbarber/ticket/master/pdb-49-unflatten-facts-from-terminus

(PDB-47) Enable structured facts from facts terminus