rvagg/node-level-mapped-index — pull request #7 by ryanramage (2013-10-18 03:56:26+00:00)
Title: Reduce support

In order to support a few chained map reduce as outlined in this package: https://github.com/ryanramage/map-reduce-chained

Here is a summary of the changes offered:

- ability to pass in reducer function, and initial value
- revert back to emitting the key, and value that user has provided to keep reduced values
- get the original id for the second lookup from the end element of the key array
- allow passing through options to createIndexedStream via getBy function
- on setup return the db if already configured to support chaining