[tracker] (7 commits) ...Merge branch 'async-get-connection'

[Martyn James Russell <mr src gnome org>]

Summary of changes:

  4b430f7... libtracker-sparql: Added get_async() and get_direct_async() (*)
  58942c3... libtracker-sparql: Fixed waiting for service for connection (*)
  074e336... libtracker-sparql: Don't always assume direct_only in get_i (*)
  87f11a5... libtracker-sparql: Fixed build failure with new connection_ (*)
  25073e5... libtracker-sparql: Added locking to sync/async connection_g (*)
  86ffaa3... libtracker-sparql: Updated documentation got async-get-conn (*)
  f4c71c4... Merge branch 'async-get-connection'

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