[tracker] (11 commits) ...Merge branch 'wip/carlosg/http-endpoint' into 'master'

[Sam Thursfield <sthursfield src gnome org>]

Summary of changes:

  62c17e7... libtracker-sparql: Add private/abstract TrackerSerializer o (*)
  3fc5916... libtracker-sparql: Add private JSON serializer subclass (*)
  c454bb8... libtracker-sparql: Add private XML serializer task (*)
  9b884ee... libtracker-sparql: Hook XML/JSON serializers to constructor (*)
  8be9514... libtracker-sparql: Add HTTP endpoint implementation (*)
  1be1335... tracker: Add --http-port option to "tracker3 endpoint" comm (*)
  0e3cd6f... tests: Add basic functional test for the HTTP endpoint (*)
  31653cd... libtracker-sparql: Add signal to control access to HTTP end (*)
  cb03c76... tracker: Add --loopback option to "tracker3 endpoint" (*)
  7843914... docs: Document --http-port/--loopback options in endpoint m (*)
  af0d494... Merge branch 'wip/carlosg/http-endpoint' into 'master'

(*) This commit already existed in another branch; no separate mail sent