Embedd Zookeeper download/execution into integration tests.

Leveraging the kazoo.testing.KazooTestHarness and some bits
from their Makefile, we can now run unit tests locally against
a live Zookeeper instance that starts up and stops for each
set of tests.w
Bugfix: Ensure that pip packages are installed before running tests.
Remove leftover Vagrant config file.
Pep8 cleanup
Convert README to Markdown format.
More formatting cleanup of the README
Fix display of coverage test results.

nose.run(argv=<args>) throws away the first argument (expecting
it to be the actual app name), so we have to pass in our PACKAGE
name there to ensure the rest of the arguments are used properly.
Merge branch 'master' of github.com:Nextdoor/ndserviceregistry into integration
Merge pull request #31 from diranged/integration

Enable integration tests leveraging the KazooTestHarness