use redcarpet

maruku and kramdown both had problems with UTF-8.  RedCarpet seems all
good.  Also add --trace to help sort out the underlying cause.
Typography Changes

* Use non-system fonts
* Use sans for headings and serif'ed for body text
* Increase size and line-height for more space
* Change title styles for more contrast
* remove font names from CSS, favoring font types (e.g. sans-serif instead of helvetica)
* Make the intro text contrast more
Merge pull request #25 from davetron5000/markdown-and-stuff

Markdown and stuff