Add the citation back into the annotation card

Dokku: https://1390-add-citation-to-annotation-card.dokku.hypothes.is/

This adds back the page title and domain to the original page if present in the annotation data. I've used a more conversational way of displaying the data because I believe it's friendlier and does a better job of presenting the card to the user than just having the url and title sitting underneath the quote. We have the space on the standalone page to do things like this, I think we should take advantage of the opportunity.

![screen shot 2014-08-20 at 17 14 29](https://cloud.githubusercontent.com/assets/47144/3983087/b31df0b8-287c-11e4-9ed7-de89242bcba7.png)

@hypothesis/product thoughts please.
Want to fix this comment really quickly and then I'll merge it?