(PDB-711) Initial work on factset end-point

Got some of the json "restructuring" stuff done, need to connect it with
data coming from the DB.

Rename factset app from copy/paste problem.
(PDB-711) Add factsets endpoint to V4 PuppetDB API

This pull request adds the /factsets endpoint specified in the
"Structured Facts Design and Plan" document circulated to Puppet-dev
on June 30.  The response is a list of maps, each describing the
facts, environment, and time of most recent fact submission for
an agent node.
Merge branch 'ticket/master/pdb-711-factset-endpoint'

* ticket/master/pdb-711-factset-endpoint:
  (PDB-711) Add factsets endpoint to V4 PuppetDB API
  (PDB-711) Initial work on factset end-point
(PDB-712) Adapt PDB import/export to structured facts.

This pull request accomodates structured/typed facts in the PuppetDB
import/export routine.
Merge pull request #1022 from wkalt/ticket/master/pdb-712-structured-export

(PDB-712) Structured facts export/import
(PDB-713) Modify anonymization to support structured facts

This pull request modifies the PuppetDB anonymization tool to retain some
structure in anonymization of structured facts. Top-level values are now anonymized
random values of matching type.  Maps are anonymized to a maps containing a
random string.