Adding a grunt.js build script to concat and minified the files

This adds a [grunt.js](http://gruntjs.com/) build script.

I added a lint (for the grunt.js file), concat to concatenate all the needed js files together and a minify task to have to distribution file.

The end result is a fully concatenated file over at dist/ooyala-web-uploader.js and a fully concatenated and minified file over at dist/ooyala-web-uploader.min.js 

Currently this isn't version so I just left the files in the main directory. But if it start getting version we can change the script to do something like v1.1/web-uploader.min.js, etc..

Hope you find this helpful. Right now the need to include 7 different scripts seems a bit intense. I left out the base64.js file since that seems to only be needed in the php-example so it's not part of the main distribution.

I can chat more about this is needed :)