2.3.1:

- 2.3.0 paranoid mode
- mingw build fixes
- MANY other fixes!!

1.5.2:

- a C wrapper was added to enable C programs to use GNU ZRTP
- some fixes in the code (race condition solved)
- better support of multi-stream mode
- change the old cxx file extension to cpp, some build system don't
  like the old cxx (Android NDK for example)
- and much more

--
Add CMake configuration files.
