Added documentation for TestCase.assertRaises().
Added text for "Mapping concepts to classes", and merged it into the
front matter instead of separating it into a new section.
Removed use of "assert" in examples.
Update the descriptions to reflect further changes from discussions on
the pyunit-interest list.
Added documentation for the defaultTestLoader object and the
TestLoader methods.
Added the assert*() names for the TestCase helper methods.
Added description of optional parameter to the TestSuite constructor.
Added descriptions of the TestLoader and TextTestRunner classes.
Added method descriptions for the TestCase class.
Steve Purcell's documentation, and a lot of it is written based on
using PyUnit and reading the implementation.
There is more to come, but I want to get this check in before I have a
disk crash or anything else bad happens.