End of development notice...

Updated version to 3.11.1

Updated year in copyright line to 2017

Tweaks regarding libsrtp finding and using

Now including srtp/srtp.h instead of just srtp.h

Import of version 3.9.2

Import of version 3.9.1

Import of version 3.9.0

Import of version 3.8.2

Import of version 3.8.1

Import of version 3.8.0