Taffmat

- Bumped version

Changed
- Updated dependencies in `requirements.txt`
- Removed `osx` from `.travis.yml`

Fixed
- Wrong package was called in test task.

Added
- Invoke `inv test` task now provides coverage report.

Changed
- Migrated from Travis legacy to container-based infrastructure
- Updated numpy to 1.9.2
- Updated other pip requirements

Bug Fixes
- `pip install taffmat` failed because `README.md` was missing. Fixed by
replacing `README.rst` in the `MANIFSET.in` with `README.md`

- Moved AUTHORS.txt to AUTHORS.md
- Moved CHANGES.md to CHANGELOG.md
- Switched to shields.io badges
- Updated README.md

Enhancements
- Made Python 3.3 & 3.4 compatible [isuee-8][]