One highlight directive added.
Started highlight_code.py, reads single lines to be highlighted.
Merge branch 'master' of http://github.com/ehmatthes/intro_programming into highlight_code
Finds lines to highlight, writes other lines unmodified.
Mostly works; off-by-1 issue in line numbering.
Highlight_code called from build_html, off-by-1 fixed.
Finalized style choice for now.
Removed diagnostics.
Finished commenting script.
Highlighted appropriate lines in visualization_earthquakes.
Refined highlighting.
Added no-highlighting version of visualization_earthquakes for development discussion.
Merge branch 'highlight_code'
Removed no-highlight version of visualization_earthquakes.
Clarified error message.