Release version v1.4.3.
Fix a flaky test.
First pass at coveralls integration.

This adds `cover` and `coveralls` envs in `tox`, and a call to `coveralls` in
`.travis.yml`.

Settling for 60% coverage for now.
Add coverage badge to README.
Fix an encoding issue, add a test.
Merge pull request #90 from craigcitro/master

Fix an encoding issue, add a test.
Version 1.4.4.