Load Facebook Page Plugin Asynchronously

[OC2PS]

Facebook social plugins slow down page load, eroding user experience. Load the Page Plugin JS asynchronously. See hints at http://www.pcsteps.com/3260-add-facebook-page-plugin-asynchronous-code/

[irkanu]

My latest commit loads the page plugin javascript asynchronously. See commit be7e020

If you'd like to see it handled differently, then please submit a pull request with the code modified to your liking. :)

I'd be happy to review it. 👍