Clean fail if the tag does not exist
Fixes #5126 Adding code that will fail the release script, if attempt to re-package an existing version.
Next version is the next minor release by default cc @tsteur
(w/ feedback) should only be displayed when there really is some feedback
reverting to tests pass
refs #5192 fixed some screenshot tests
Merge branch 'master' of github.com:piwik/piwik
updated submodule
Merge remote-tracking branch 'origin/master' into morpheus_defaulttheme