Server-side mass update function

[wohali]

We get this one a lot on IRC: "I want to write a JS function that goes to CouchDB and CouchDB runs it on every document in the database." Basically, a way to submit server-side jobs to update all the docs in the database somehow.

[wohali]

Noting that if we implement #1280 or #1498, the syntax for this could become very simple.

[ngspinu]

https://github.com/cliffano/couchtato - we use this to iterate through all the docs. But, definitely, a built in solution would be highly appreciated.