Start an othersites page

This patch:

* Moves the twitter embed to an embeds directory in templates
* Adds a LibraryThing template in the embeds directory in templates
* Starts an othersites page that has sections for our other sites

Todo still:

* Abstract out into a model, so people can easily change/modify which sites
* Make it so that OtherSite objects can also have their own individual pages

Conflicts:

	HedyNet/HedyNet/urls.py
Add ravelry to other sites