Re-add FB SDK JS. Fixes #791
Update og:urls to use www subdomain. Fixes #780
Merge pull request #793 from gregmarra/likebutton

Like button fixes
Improve webcast page. Fixes #781
Merge pull request #794 from gregmarra/webcasts2

Improve webcast page. Fixes #781
fix event rankings parser return value
prevent adding the same webcast to an event
write cache headers for api v2 in _render
headers cleanup