Remove kafka src submodules
Add kafka 0.8.1.1 to integration tests.
- previous 0.8.1 src appears to have actually been 0.8.1.1
  based on git submodule commit.  So technically this adds back 0.8.1
  to the test suite.
Update tox.ini to use {posargs} to configure nosetests.
To override defaults, use
  `tox -- --your --nosetest --options --here`
Update default nosetest settings to use verbose logging and show test ids
add .coverage and .noseids to .gitignore
Add example for running single unit test to README