Upgrade for node-validator

I'm using your module for a lot of my restify based api's thanks for sharing it.

I've forked and updated the package.json to get the latest node-validator version. I was having a problem that booleans and numbers had to be stringified before they would be accepted. So { foo: true } wasn't accepted but { foo: "true" } was.

Quite a few of the old validators have been renamed or merged so I had to code up some compatibility code. I've gotten all the unit tests validating again.

I've also updated the link to node-validator in the README and added node_modules to .gitignore.