Grunt s3

@pfiller @stof This is branching off of master on my own fork. I've added the ability to zip and deploy the jquery plugin files to S3. It automatically names the file according to the current version as well as updates the jquery.json file with the custom `download` url.

The biggest win for this change is to not have to track the generated files anymore. I'm really looking forward to PRs without js file changes :D