- use latest patch releases of all python versions via pyenv
- use caching to speed up travis builds
- peg to latest versions of test deps (including hypothesis 2.0)
- set hypothesis to strict
- explicitly set average_size on strategies that accept it
- drop pypy3, not worth supporting till it catches up to cpython
- only pass --cov for python27 and 35; with other versions, it slows down
hypothesis data generation so much, the health checks fail
- refactor tox and travis setup to use new test.sh helper script