[MERGE] Cherrypick and polish the RemoteSink for streaming push.

[Andrew Bennetts]

Andrew Bennetts has voted approve.
Status is now: Approved
Comment:
Looks good.

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C1235118639.6233.151.camel%40lifeless-64%3E
Project: Bazaar