setup.py: updated dependencies
setup.py: removed unreachable code from tox test runner
gitignored *.egg files
setup.py: use py.test instead of tox
tests: fixed pylint identation warning
tests: "run" cassette stripped from excessive data
tests: fixed cassettes path
settings: fixed loading from defaults
tox.ini refactored
use "cover" env for code coverage
README.md: added Coveralls and Gitter badges