Log Message:
Update to 2.1.3:

Changes for libmusicbrainz 2.1.3
-------------------------------------

   - New queries for selecting album artists:
      - MBS_SelectAlbumArtist
      - MBE_AlbumGetAlbumArtistName
      - MBE_AlbumGetAlbumArtistSortName
   - New query MBE_AlbumGetCdindexId
   - Using size_t instead of int in networking code
   - Little fixes in the API documentation
   - Python bindings:
      - Using the new ctypes 0.9.9.x API, with support to fallback to
        the old API if only an old ctypes version is installed
      - Removed dependency on ctypes in setup.py