Adds export as json option for Shipping Rates

Needed a way to get shipping rates into the frontend, where I am using them for a shipping calculator on individual products.
Sorry that's my inexperience with git showing me up there..

On 14 Sep 2014, at 18:55, John McLear <notifications@github.com> wrote:

> In shopifyFD.js:
> 
> > @@ -236,7 +236,7 @@ return {
> >  		if(id){
> >  			var mycontent = $("iframe").contents().find("#tinymce"),
> >  			myhtml = mycontent.html(),
> > -			metaJSON = {
> > +                        metaJSON = {
> :?
> 
> —
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