CentralNotice deploys off 'wmf_deploy' branch

Fundraising has gone crazy and decided that we want to be able
to have a potentially unstable master / avoid deploying potentially
shakey code to the cluster. Thus we now have a wmf_deploy branch
which site deploys will deploy from.

Change-Id: I177345dfa76b640afc5a256b7a93aac8358a04d0