tox.ini: Add nose dependency; PyYaml => PyYAML
testconfig.py: Handle ConfigParser => configparser rename in Python 3
Add additional tests that use the nose plugin testing infrastructure
tox.ini: Run new nose plugin tests
TODO: Remove "Create unit tests...for testing nosetests plugins" as I
did it.
Add missing `encoding` params to `load_*` calls.

This eliminates errors like `TypeError: load_ini() missing 1 required
positional argument: 'encoding'`
Merged in msabramo/nose-testconfig/nose-plugin-test (pull request #3)

Add nose plugin tests
Merged in msabramo/nose-testconfig/add_missing_encoding_param_to_load_calls_pr (pull request #4)

Add missing `encoding` params to `load_*` calls.
bump version to 0.9