bug 924434 - update home page news
Merge pull request #1260 from kyoshino/bug-834422-meta-ogp

Bug 834422 – Add Open Graph Protocol (OGP) and Twitter Cards to most mozilla.org pages
Merge pull request #1297 from craigcook/bug-924434-home-news-updates

bug 924434 - update home page news
Bug 834422, og:image should include a protocol

Facebook doesn't accept protocol-relative URLs in the `og:image`
property. Added an option to `media()` to include a protocol.