Add support for lists in from html plugin

Hi Guys,

I tried to add support for OL and UL lists in from_html plugin.
I have few issues there, the biggest one is that I don't know how to add bullet point so there is dash for now.
Another one si with spacing from bottom on lists which is probably not done very clever way :)

Feel free to ignore or change anything here as its not perfect, but I saw few people demanding support for lists so it might help someone.