Remove pytest runner

conda-build error points to pytest-runner. removing it from setup and see if it works better?

Python 3.6.* in setup.py

We ensure package may be installed on a system with any Python 3.6 system (i.e. 3.6.*). Previously I've forgotten that *, causing test failures.

Add pytest, Travis CI, and MANIFEST.in

What's new:

• Add a MANIFEST.in to include README.rst and LICENSE.txt. This file was missing in previous release 0.1.0
• Incorporate pytest for testing (we also include a subdirectory /pyjc/tests/ to enable writing new test scripts).
• Incorporate Travis CI for Continuous Integration. Note the new /.travis.yml. (Travis CI status is included in README.rst)

(Note: I've deleted the PyPi version 0.1.1 package as an experiment. As I cannot reupload the next release will have to be under a higher version nunmber)

Hello World!

Aim:

>>> import pyjc
>>> pyjc.helloworld()
Hello World!