Merge pull request #2 from azul/feature/couch

split out bigcouch and only apply if needed, initial code for replication
fix typo in _couchdb_multimaster.json
Merge branch 'feature/couch' of github.com:elijh/leap_platform into feature/couch
new generic system for stunnel: just `include site_stunnel` and stunnel + needed shorewall will be automatically set up. requires new leap_cli
tmp comment out error if no master nodes defined
site_couchdb: support auto-stunnel setup, split master, bigcouch, and mirror out into separate files.
add replication user