[tracker] (8 commits) ...Merge branch 'epub-metadata-improvements'

[Martyn James Russell <mr src gnome org>]

Summary of changes:

  9df1af0... tracker-extract-epub: Extract more metadata, including auth (*)
  68dd2e5... tracker-extract-epub: Fix coding style for recent work from (*)
  8b43603... tracker-extract-epub: Make sure we consistently use g_{free (*)
  08ad7ea... tracker-extract-epub: Improve debugging (*)
  edd6a01... tracker-extract-epub: Fixed roles extracted (*)
  a802a2a... tracker-extract-epub: Fixed remaining strndup() cases and s (*)
  ae198ae... tracker-extract-epub: Fix ontology and sparql used so it's  (*)
  c5068db... Merge branch 'epub-metadata-improvements'

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