Async loads for JavaScript to speed up rendering

Suggested by Google
http://developers.google.com/speed/pagespeed/insights/?url=tinkersoc.org&tab=desktop

Info on async tag:
http://www.w3schools.com/tags/att_script_async.asp
Missed an async

Oops
BarCamp Canterbury Blog post
Merge branch 'master' of https://github.com/graymalkin/TinkerWeb