documentation and README

[nicferrier]

This code is great but it's a bit lacking in documentation.

Here's a patch to make that a little better.

I also intend to package it.

[nicferrier]

I am packaging this and adding it to http://marmalade-repo.org

[m2ym]

I don't know creole format. Could you please use Markdown instead?

[nicferrier]

I've switched to markdown. This pull request also includes some fixes (for nulls).

I am converting marmalade-repo.org to elnode and that's informing my patches as that's a mongo based app.

https://github.com/nicferrier/marmalade/ the original, node.js implementation;

https://github.com/nicferrier/elmarmalade my new, elnode based, implementation.

[m2ym]

Now I added you as collaborators. Feel free to push to my repo.

[m2ym]

If you have an intention to work on mongo.el continueously, I'd like to add you as authors. How about?