v2.3.167

Core

Updated to e16 serv
Fixed callbacks for group info iq
Use s40 env by default
Updated to s40 v2.12.189
Fixed error in android env with python 2.6, thanks to Alexander Bergolth

Protocol

Removed "av" from enc nodes
Added contact sync notification

yowsup-cli

Deprecated --moxie
Optional arguments support in yowsup demo, thanks to @jlguardi
Fixed error when axolotl is not installed