imdb_list import from HTML  page instead RSS feed

imdb watchlist rss feed is broken right now and can't be sure when and
if it will be back up. this will now parse the html page for movies and
create entries.
Indent looks a bit large here, make sure to use 4 spaces for all indents. We have a pep8 checker which can help find some of these problems for you too. http://flexget.readthedocs.org/en/latest/develop/index.html#code-style