0.8.0 upgrade scripts

[Damien Katz]

We need scripts to upgrade couchdb to 0.7 to 0.8. The first script  
will dump a database to a json text file, then the server is upgraded  
and restarted, then the second script reposts the dumped data back to  
the server.

Also a closely related thing is incremental backup and restore  
scripts. A backup script incrementally dumps db changes to text files,  
and a restore script that posts the data back. I'm thinking we'll need  
some couchdb API enhancements to make this fast as possible, but it's  
perfectly doable with the current API.

Any volunteers?