Delete documentation files we won't be using any more
Update comment in setup.py
Don't automatically set PYTHONPATH when running integration tests

The idea is that the integration tests should also be run to verify that
an installation is working properly.  This test may be falsified if we
set the PYTHONPATH automatically.
Fix a wrong exception name
new commands to run tests and build docs
More updates to documentation
Merge branch 'better_setup'