Tiles

Display basic tiles for latest articles on the homepage of publify

- in order to display just headlines of articles I had to remove functionality and tests for outputting password forms for password protected articles, as the general concept for a homepage of a blog is to show all the latest articles (including the body of the blogs).
- Jon Lind confirmed there is no requirement for password protected articles, so the easiest way was to strip out the logic which displays the password form instead of the body of an article, and remove the ability in the admin to password protect an article.
:shipit: