Update EXTRA_DIST for tutorials and other documentation.
Globally refer to "instance management events" as just "instance events".
Update to RtAudio 4.0.12.
Update AUTHORS.
Add some release notes for upcoming 0.3 release.
Keep NEWS in a markdown format.
Merge remote-tracking branch 'malloch/master'
Add the RtAudio readmes to the release tarball.
Add libmapper.org to the README.