attachments from old revisions and standalone API

[Adam Kocoloski]

Hi, I'm wondering about the behavior of the standalone attachment API  
w.r.t. old/conflict document revisions.  Currently, the GET handler  
for attachments completely ignores the rev query-string parameter.   
That seems like a mistake to me.  In fact, the replicator relies on  
the ability to retrieve attachments from conflict revisions using the  
standalone URL, so I guess its broken :-P

I've opened https://issues.apache.org/jira/browse/COUCHDB-337 and  
attached a patch to the ticket for review.  Cheers,

Adam