[libmediaart] (18 commits) ...Merge branch 'api-cleanup'

[Martyn James Russell <mr src gnome org>]

Summary of changes:

  6874977... tests: Removed unused function (*)
  aca5903... extract: Make GFile first parameter for _process_file() (*)
  a1b2d8b... extract: Allow error reporting with API using GError (*)
  ce450d6... extract: Refactor media_art_process_file() to simplify the  (*)
  8f9056a... extract: rename (private) media_art_heurstic and make args  (*)
  4e14f48... tests: Test for no error with media_art_process_file() with (*)
  1ba4e37... extract: Switch to initable MediaArtProcess object  from _i (*)
  a3b64fe... storage: Make g_message() calls g_debug() calls, output is  (*)
  0669d1e... extract: Use a more logical ordered heuristic for caching s (*)
  44c8e4a... extract: Add GError * reporting right down to the plugins ( (*)
  91f827e... tests: Don't expect media art extraction for NULL data buff (*)
  adaa018... extract: Add GError for _NO_TITLE, which is required in som (*)
  0d231f2... extract: Add _SYMLINK_FAILED error and report symlink() fai (*)
  733ce3f... build: Improve warnings used when compiling (*)
  92cb3a3... docs: Fixed Makefile so we don't fail on distcheck with --e (*)
  880d09f... libmediaart: Split API into  _process_buffer() and _process (*)
  23f3c73... extract: Fixed 'since' versions in documentation (*)
  f868869... Merge branch 'api-cleanup'

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