Switch to scm to maintain versions and add automated pypi pushes

One easy way to maintain the version of the package is to use git tags or releases along with the setuptools_scm module. Check this out: https://pypi.org/project/setuptools-scm/

We can also setup a Travis CI automated build to automatically push new releases to PyPi

Then all you need to do to update the version is create a new tag on github, everything else is taken care of.