Couchbase sync gateway

Resolves jira task BROOKLYN-9
I thought our `BashCommands.installPackage(saveAs)` would do this? However, I don't see `dpkg` or `rpm` in that list (despite mention in the javadoc of `BashCommands.installExecutable`).

Longer term, would be good to get our `BashCommands.installPackage` to handle dpkg and rpm as well.