opusfile version 0.6

The opusfile and opusurl libraries provide a high-level API for
decoding and seeking within .opus files on disk or over http(s).

opusfile depends on libopus and libogg.
opusurl depends on opusfile and openssl.

Changes since the v0.5 release:
 - Fix bugs with comment handling
 - Fix build for BSD
 - Fix bugs handling invalid and non-opus streams

Some of these bugs kept basic functionality of the APIs from
working at all, so we recommend all users upgrade.

The library is functional, but there are likely issues
we didn't find in our own testing. Please give feedback
in #opus on irc.freenode.net or at opus@xiph.org.

Programming documentation is available in tree and online
at http://opus-codec.org/docs/