Adding "sudo: false" to allow faster builds on Travis.

See
http://blog.travis-ci.com/2014-12-17-faster-builds-with-container-based-infrastructure/
for more info.
Removing out-of-date __version__ in sub-packages.
Merge pull request #435 from dhermes/remove-old-versions

Removing out-of-date __version__ in sub-packages.
Merge pull request #433 from dhermes/enable-docker-on-travis

Adding "sudo: false" to allow faster builds on Travis.
Adding PyPI badge to README.