remove redundant web directory
add tasks.txt file for assignment clarity
update to latest virtualenv (1.11).  This requires now that the virtualenv_support directory be present in the same location as the virtualenv.py script since it uses that location to install pip/setuptools
update resources for the api/mashup session
update slides for api/mashup presentation
add assignment for session 3
add optional tasks, complete assignment submission description
fix missing newline at end of doc
add a basic intro to HTML to the session 3 readings (in support of the scraping lesson)
fix missing links
typo fixes from in class.
use string.format rather than the % operator
set up unit tests for the little app we will write in class.
fixes for typos and formats and stuff
set up assignment for session 04
fix archaic directory references in session 03 tasks.
add homework assignment slides to the presentation