added lab on list, dict and set comprehensions
a bit more on list comps -- plus set comps.
added a coding bat exercise
Merge branch 'master' of github.com:UWPCE-PythonCert/IntroToPython
Update comprehension.rst
Update comprehension.rst
a little tweak to the presentation.
Merge branch 'master' of https://github.com/UWPCE-PythonCert/IntroToPython
added excercise to comprehensions lab
Merge remote-tracking branch 'upstream/master'
got the lambda / functional part in...
added html generating exercises and solutions...
pretty much done...
added lightning talks to week 7
Update simple_classes.py

Fixed typos in __init__ declarations for Circle derived classes.
Update lambda_keyword.rst
Merge remote-tracking branch 'upstream/master'
Added week-06 labs, etc.