Move jsfeat up a level in CommonJS packaging

[hitsthings]

This way it can be require'd like:

var jsfeat = require('jsfeat');

Rather than:

var jsfeat = require('jsfeat').jsfeat;

Btw, just want to rehash that it's probably best for you to own the module on NPM. If you tell me a user, I'll make them the owner.

Deploying new stuff to NPM is just:

• Update the version number in your package.json.
• npm publish (NPM comes with Node, so you need that installed.

Cheers!