This is a first rough commit for #95, adding the ability to embed YouTube videos in forum posts. Some more polish and testing needs to happen at this point. I wanted to get all these changes off my hard drive and into the repository.

Dear {{ to_name }},

Your friend, {{ sender_name }}, wanted to send you a link to an 
interesting story found on {{ site_name }}.

{{ story_title|safe }}
http://{{ site_url }}{{ story_link }}

Thanks!
http://{{ site_url}}