Add new pypy3: http://blog.travis-ci.com/2014-07-24-upcoming-build-environment-updates/
Cover pypy
Better documented limited MPO save feature.

At present it’s only possible to save the current frame of an MPO, not
the MPO in its entirety. Added testing verifying as much.
Dropped unused "options" from MPO save.
Merge pull request #830 from wiredfool/mpo-rebase

MPO Save Documentation
Merge pull request #828 from hugovk/pypy3

Cover PyPy and add PyPy 3