minor tweeks
added updated sparse array
fixed slicing in class, added new test to check adding in values like list does, this test failing
passing test for adding in a slice longer than advertised. probably could use some refactoring
cleaned up session 09 and added ipython log.
Merge branch 'master' of https://github.com/UWPCE-PythonCert/IntroToPython
session 10
Homework started
Merge branch 'master' of https://github.com/UWPCE-PythonCert/IntroToPython