Add blacklist for locales  (#309)

This is for issue #309. I added here the changes for the pulse script and also the blacklist for staging beta and release, for testing. So as discussed, the blacklist will have priority when there are both.
That doesn't necessarily mean that the blacklist has higher priority. For the mentioned case I don't see a reason to evaluate the whitelist at all, if the blacklist already has lists a specific locale. So if the blacklist tells you to stop, do it immediately. Only afterward process the whitelist.