Log Message:
Update to version 2.1.1.

Changes for libmusicbrainz 2.1.1
-------------------------------------

   - Return special TRMs for special conditions for TRM generation:
     c457a4a8-b342-4ec9-8f13-b6bd26c0e400  -- Sigserver busy and overloaded
     f9809ab1-2b0f-4d78-8862-fb425ade8ab9  -- Source file is too short to
     calculate TRM
     7d154f52-b536-4fae-b58b-0666826c2bac  -- File is slience

   - If the TRM signature server becomes overloaded, it will now start
     returning HTTP 503 error codes and the TRM generator will catch that
     and return the Sigserver busy TRM shown above.

Changes for libmusicbrainz 2.1.0
-------------------------------------

   - moved the python bindings into a new seperate project
   - rewrote the mp3 duration detection code to be more robust
     by making it vastly easier. In the process the bitzi
     related code has been tossed. This should make the libary
     smaller and the mp3 duration checking faster.
   - Due to the bitzi code being removed, the SHA1 and Bitprint
     related functions have been removed.
   - Added query items for Release Dates/Countries, Amazon Asins and
     Amazon cover art URLs
   - Move include files into include/musicbrainz so that the example
     files will compile outside of the libmusicbrainz client
     source tree.