Print URL of preview server upon start.
Make Atom feed the default for Subscribe links.
Escape post URLs correctly in Atom and RSS feeds.
Add .nojekyll to deployed site. (#13)
Disable Disqus commenting. (#6)

Nobody has posted or attempted to post a comment since site inception (3 months ago).
Therefore commenting is not being used by site visitors.

Furthermore Disqus is now recommending "related articles" from other sites.
And making lousy recommendations. This both siphons visitors away and gives me little
confidence that my own articles are getting recommended appropriately on other sites.

Finally, Disqus is suspected of forcing IE into compatibility mode (unless overridden
with the X-UA-Compatible header). This would be due to invalid markup Disqus inserts
via JavaScript.
Add favicon to Atom and RSS feeds.
Use PNG icon in RSS feed to make validator happy.
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