Fixed #64 - pip package for Astronomy Engine.

Thanks to ebrominio, I was able to create a pip
package for Astronomy Engine. See:

https://pypi.org/project/astronomy-engine/1.0.1/

I will probably need to go back and keep the version
numbers in sync with the matching npm package.

source/python/.gitignore

@@ -1 +1,3 @@
 *.pyc
+astronomy_engine.egg-info/
+dist/