Remove animal files not present in Intro session as this is an extension
Remove some notebooks that appear to be individual classroom work output
Copy existing instructor notebook to a new notebook for development
Change metadata for new software engineering notebook
Add outline, description of software engineering, and goal
Modify goal to add command-line example.
Add creation of sightings file from Intro exercise
Add Refactoring description and exercise
Add introduction to testing and examples
Add description and examples for nose
Update notebook to be self-contained instead of using standlone external modules
Add curl and wget links for IPython nose plugin
Remove python/testing; we won't be using that material
Remove python/debugging; we won't be using that material
Add example headers
Fix the nose failure by fixing the bug, not nopping the test
Add the start of TDD and the exercise
Fix a typo in a docstring
Finish up the section on TDD
Add description and examples for Exceptions