Shaun Geng

Added a `ll` command to inspect the schema of the specified node. It also gives a preview of the value each child holds. For strings only the first 80 characters...

Add redis support

1

Should allow using redis as the backend.

The current implementation of slicing does not support negative step. Given the following data ``` db = jsondb.create({ 'name' : 'foo', 'items': [ {'id' : 0, 'name' : 'a'}, {'id'...