add longpolling for _changes
----------------------------

                 Key: COUCHDB-421
                 URL: https://issues.apache.org/jira/browse/COUCHDB-421
             Project: CouchDB
          Issue Type: New Feature
    Affects Versions: 0.10
            Reporter: Benoit Chesneau


Implement longpolling on _changes. Instead of continuous, longpolling hold 
request until an update is available then close it. The client will have 
to ask a new connection. Should solve problem for XHR's  that don't have that status changed (on ie, opera..) .

I've put all the code in my github repo :
http://github.com/benoitc/couchdb/tree/longpoll

diff against trunk is attached.

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