use Require.js to load Prism.js (see msg)
-remove prism.js script tag site-wide via _includes/footer_js_partial.html.
-shim in prism.js in the js/config.js file.
-create a RequireJS module called "prismInit.js", which loads 'window.Prism' and list as a dependency.
-rearrange order of paths and shims in js/config.js file.