Elizabeth Patitsas comments on python.html exercises
After conversation with Jon Udell, removing XML stuff from web chapter:
will use JSON for all examples instead.  This will free up space to talk
about other things (e.g., Google Fusion tables).
Command to display history graphically in Git
setup/terminal.html: Remove Cygwin reference from OS X instructions

Reported-by: Amy Brown <amyrhoda@gmail.com>
Merge pull request #349 from wking/os-x-no-cygwin

Remove reference to Cygwin under MacOS
Merge pull request #345 from gvwilson/book

Recent work on the instructor's guide.