trivial: update readme
tox.ini using setup.py dev
setuptools test_suite
tox.ini uses setup.py test -q
Test coverage
Do not use xunit. coverage instead of xcoverage.
Ignore .coverage
Restrict nosetests to our package
gitignore: .coverage is a file
Fix dnozay README as per #81
Further fixes to README
Fix email link in README
Remove build badge
Merge pull request #89 from kuba/tests-setup

Improve tests setup, incuding coverage.
Merge pull request #90 from kuba/pr/81

README: multi-OS support with disclaimer