Automate build and test of Python client on Python 3.x

Travis works great for Python 2.x and 3.x on Linux. Need maintain Jenkins and add Python 3 on Windows. Testing on Windows manually in the mean time.

see: https://travis-ci.org/Sage-Bionetworks/synapsePythonClient

We have a Travis build that works automatically on check in building on Linux only for Py 2.7 and 3.x

Need to add automated testing for Mac and Windows

Xa has windows builds happening automatically now on Jenkins.