increase version before releasing 3.3.0-rc.1
version 8.2 of gt-opengis became somehow invalid, so we use a somewhat higher version (including gt bugfixes)
Merge remote-tracking branch '52North/develop' into versions/v3.3.0-rc.1
don't use snapshot versions
Merge pull request #131 from ridoo/master

releasing version 3.3.0-rc.1