Remove class-based testing helpers.

They were rather unpythonic anyway... hope that no one misses them.
tests.test_case_tests: Add some docstrings.

Next time I won't have to remember why some of this code is as
gnarly as it is.
tests.test_case_tests: Collapse some related test cases.
Remove imports from fluenttest/__init__.py.
docs: Switch to the RTD theme.

Cause blue is the new green!
Rework documentation.
test_case_tests: Remove unused module.
README: Add badges.
TestCase: Use setUpClass and tearDownClass.
Add examples.
.travis.yml: Add PyPI deployment.
Merge pull request #1 from dave-shawley/remove-class-testing

Remove class testing