Added RSS feed, some more config params, and heavy footer

- Added RSS feed
 - Located at /rss.xml
- Added some more config options (See example in README for details)
 - redirectWWW --> redirect all www.domain.com traffic to domain.com
 - rss --> enable rss feed. Can be one of the following values
  - false (don't have an rss feed)
  - { description, author, img, limit }
- Changed default template to always push footer to bottom
- Updated README.md with more detailed example app