Refactor: Python packages should be installed as modules, and not use source files (#149)

* Python packages should be installed as modules, and not use source files

* Use child_process spawn to call command and return data

* Consistent error rejection & resolve around spawn calls.

* Updated README to remove submodule ref & added how to install pip pcks.

* Resovled linting issue

* Removed python-shell package

* Disable stray functionality, unused & has dep to python-shell

* Uncommented/disabled python-shell dependency in strayRepository.

package.json

@@ -27,7 +27,6 @@
     "form-data": "^2.5.1",
     "jsonwebtoken": "^8.5.1",
     "km-moviedb": "^0.2.12",
-    "python-shell": "^0.5.0",
     "raven": "^2.4.2",
     "redis": "^3.0.2",
     "sqlite3": "^5.0.1"