New ZRTP version

Dear all,

I've just checked in the new libzrtpcpp version 1.4.2 . It is
API/ABI compatible with 1.4.0 and 1.4.1, so no need the recompile
or relink you applications.

This version

- implements the new Key Derivation Function as defined by ZRT spec 12
- increase the protocol identifier to 1.10 - thus be carefull when
  testing your apps with older versions

David, would you be so kind and produce a new release? Thanks.

Of course the Java version (placed under "contributions") was updated
accordingly - just refesh your SVN and do a "ant bindist". Sorry, no
real ZRTP Java release is available. David, can we have a short discussion
how to address Java releases?


Regards,
Werner