[Evolution-hackers] Back on 6-months release cycle and sync version with GNOME 3.16

[Milan Crha <mcrha redhat com>]

        Hello,
the Evolution (and evolution-data-server, evolution-ews, evolution-mapi)
made their 3.12.x/3.13.x as a year release cycle and they got out of 
sync with the GNOME versioning as well. It was good for the major 
Evolution change, the movement to WebKit-based composer. I believe
the extra months (the change landed in time of 3.13.3) helped to polish
the composer and make it even more usable than it was in the initial 
commit time.

The last development release version was 3.13.90, together with
GNOME 3.15.90. The release schedule is currently in sync with GNOME 
and, after couple discussions, I'd like to return back to versioning 
of GNOME, the same as to the same release schedule. There still can be 
done extra stable releases like in time of the Evolution 3.12.x. A 
monthly release cadence seemed to be good for users too.

That said, Evolution core products will completely skip 3.14.x version 
series and will jump straight to 3.16.x. The next development release 
was planned to be 3.13.91, but it'll be the same as GNOME,
thus 3.15.91. The stable branches will follow the previous pattern, 
that is gnome-3-16 for the 3.16 version (Evolution 3.12 series used 
evolution-3-12 stable branch).

It doesn't mean there are not planned any other significant changes, 
they just might not be that huge like the WebKit-based composer.

        Bye,
        Milan