Revised "Timers, Clocks, and Cocoa"

Many edits suggested by Wil Shipley.
Jekyll build

jekyll 1.2.1
Darwin Pseudonym.local 13.0.0 Darwin Kernel Version 13.0.0: Thu Sep 19 22:22:27 PDT 2013; root:xnu-2422.1.72~6/RELEASE_X86_64 x86_64

Configuration file: /Users/jmah/Documents/Streams/dev-etc/_config.yml
            Source: /Users/jmah/Documents/Streams/dev-etc
       Destination: /Users/jmah/Documents/Streams/dev-etc/_site
      Generating... Configuration file: /Users/jmah/Documents/Streams/dev-etc/_config.yml
done.