New Documentation in README.md

[odie5533]

I added a bit of documentation to README.md which should help complement the examples.

[chjj]

Ah, I've been meaning to clean up the readme. A few small things though, it's probably important to clarify that db.kill kills the entire db. It will delete the db file and create a new one instead of merely closing it.

Also, the deep parameter specifies whether an object will contain only cached properties, (or maybe values is a better term). It doesn't refer to the objects themselves.

[odie5533]

I changed the description for kill(), but I still don't understand what effect changing deep will have on the returns documents.