Pytestify

- `--with-count-equal` optional argument to rewrite `assertCountEqual`
- Rewrite `delta=` in `assertAlmostEqual`

- Feature: Rewrites `self.assertEqual(a, None)` to `assert a is None` rather than `assert a == None`

- Fix: A class called `ThingTestCase` should be renamed to `TestThing`

- Another edge case involving multi-line comments and trailing slashes

- Fix edge case where commas in multiline asserts don't have trailing slashes but should
- Two spaces between trailing slashes and inline comments

- If assert is alone, combine the next line with it