Codemirror javascript update, load codemirror only on pages that need it

This was definitely a pain to troubleshoot but I believe it was time well spent. I installed the RoyalSlider plugin which uses the codemirror javascript libs. After some digging I see the bootstrap-start-theme is loading them on every admin page. Not cool!

I think the only page this really enhances is the theme-editor.php page. If it is needed on more then is can be specified so it does not conflict with other awesome plugins.