API Doc Improvements

This commit incorporates several sylistic changes aimed at
improving the readability of the API documentation for
Chicago Boss.

Visually, the biggest change is that a command and its
explaination appear on the same line. This has been implemented
with tables.

Changes
  * CSS (enhancements, hopefully)
  * converted <div class="code spec"> and <p> pairs
    to rows of tables
  * added several &nbsp; to minimise tables collapsing
  * removed references to maps.evanmiller.org in CSS, which
    were resulting in 404 errors
CSS in order
HTML improvements; minor CSS
Make header more consistent with homepage
Merge pull request #277 from timClicks/doc-improvements

API Doc Improvements