Version and date updtes in preparation for new release.

Documentation and version numbering in preparation for release 4.0.0.

Merge branch 'master' of https://github.com/thestk/rtmidi

There are no API changes in this release, other than the addition of …

…an optional argument to the setErrorCallback() function and the addition of a new C API. The primary changes involved updates to the build system and some small bug fixes. Note that the Windows kernel streaming code is in a separate branch, as it is incomplete.

Corrected documentation regarding API default order in RtMidi.h

Release 2.0.1 tarball

Release 2.0.0 tarball

Release 1.0.15 tarball

Release 1.0.14 tarball

Release 1.0.13 tarball