Making ccrtp propagate its build time requirement, ucommon.
As libccrtp propagates ucommon, it's not needed in libzrtpcpp.
Update ucommon to 6.0.5.

The hope that newer means better.
Adding partially sflphone (only daemon, maybe failing to build)
Making sflphone build, and its gnome client too.
Adding sflphone.

Merge branch 'sflphone'
python-six: Update to 1.3.0
python-mrbob: fix it and update to 0.1a9
Fix binutils_deterministic to not break evaluation in certain cases. Quite a sneaky bug!
Merge pull request #681 from offlinehacker/mrbob_fix

python-mrbob: Make it work, update to 0.1a9 and update python-six to 1.3.0