Merge branch 'master' into stable

* master: (51 commits)
  (PDB-783) Release notes for PuppetDB 2.2.0
  fix factsets docs typo
  (PDB-810) Load test structured facts indices.
  Deprecate PG 9.1 instead, and remove nagging about 9.3 for PE users
  Change name of fact-nodes operator to fact-contents
  (docs) Update API Index to reflect all endpoints
  (PDB-834) Update documentation titles for release 2.2
  (maint) Fix reference to greedy regexp operator
  (maint) Fix regexp array operator test failures for PostgreSQL
  (PDB-769) Deprecate PostgreSQL 9.2 and older
  (PDB-830) Regexp array operator is too greedy
  (PDB-821) Facilitate facts subqueries against fact nodes.
  (maint) Remove more dead code from facts.clj
  (PDB-820) Remove glob operator
  (PDB-809) Use json stored branch for factsets also
  (PDB-809) Store top level structured fact data as JSON
  (PDB-822) Change acceptance tests to incorporate structured facts.
  (PDB-826) Fix pathing for puppetdb-legacy
  (PDB-808) fix paging for factsets
  (PDB-718) Fact path endpoint
  ...
Merge branch 'stable'

* stable: