remove unused tests, move examples.rst to docs/usage.rst, pep8 everything
format imports according to https://github.com/plone/plone.api/blob/master/docs/contribute/conventions.rst
dont get dependencies from pypi downloaded icalendar egg but just use unittest2. more py3 configuration - tests still not run!
conditionally install unittest2 only for python 2.6
fix tox coverage configuration to also run python 3 tests by not using unit2 script