Enable testing on Travis CI
Add Python 3 support
Make test less rigorous

It was previously testing against the superzippy on PyPI, which is not
yet Python 3 compatible. This can be re-enabled once I figure out how to
install a local package. Somehow passing "." doesn't work.
Test the outputted executable

We are using "git+file://" instead of "." for now due to what seems to
be a pip bug.
Undo the previous commit

pip on Travis CI doesn't like "git+file://".
Run in verbose mode
Work around pip bug
Merge pull request #5 from myint/master

Python 3 support