Z-Push 2.3.1 released

Hi all, we have just released Z-Push 2.3.1 final (tag 2.3.1, commit 5b6688deeade1aad2fd9403914a08abdecbe3808). This is the first maintenance release of 2.3 containing a few important fixes related to Android calendaring, packages on RHEL 6 & 7, move operations...