opusfile version 0.4

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

It depends on libopus, libogg, and openssl.

Changes since the previous release:

- New API to parse album art tags.
- Visual Studio project file fixes.
- Include Visual Studio projects in source package.
- Minor unicode fixes.

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.
This tag has no release notes.