Added testling support
Exposing module on window.Valid if on the browser or through module.exports on the server.
Moved away from using JavaScript 1.6 Array functions.

So we can support < IE9 browsers.
Style consistencies
Added Makefile to help with minifing and testing module
Compiled minified version of module
Added browser example
Added function to check if param is array.

Using Object.prototype.toString which has <=IE8 support to check the
param.
Added note about browser support
Merge pull request #2 from matiasdoyle/browser-support

Browser support