[FFmpeg-cvslog] Merge remote-tracking branch 'qatar/release/0.5' into release/0.5

[Michael Niedermayer]

ffmpeg | branch: release/0.5 | Michael Niedermayer <michaelni at gmx.at> | Thu Jan 12 22:14:01 2012 +0100| [1eb78722383dd6834eb384d292cda602b98d1a9b] | committer: Michael Niedermayer

Merge remote-tracking branch 'qatar/release/0.5' into release/0.5

* qatar/release/0.5:
  Release notes and changelog for 0.5.7
  Bump version number for 0.5.7 release.
  vorbis: An additional defense in the Vorbis codec.
  vorbisdec: Fix decoding bug with channel handling

Merged-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1eb78722383dd6834eb384d292cda602b98d1a9b
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