Using closures to optimize speed of couchdb-python view functions

Python's standard library (and 3rd party modules) brings a lot of pluggable functionality that you can use in Couch view (map/reduce) and list/show functions.

Here, we'll using the couchdb-python library, which is, to my knowledge, the only well known couchdb library for Python that implements a view server (couchdbkit does not, which makes it fall out of consideration for the things I commonly need to do).