Add ability to embed Tweets

<blockquote class="twitter-tweet"><p>I CAN'T SLEEP. by <a href="https://twitter.com/origiful">@origiful</a> <a href="https://twitter.com/search?q=%23woodman&src=hash">#woodman</a> <a href="https://t.co/3WKigtewHE">https://t.co/3WKigtewHE</a></p>— Ian Padgham (@origiful) <a href="https://twitter.com/origiful/statuses/370353409905680384">August 22, 2013</a></blockquote>
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