Adds test of installation via Pypi test server, and includes __init__.py to fix issue when importing

Author: James Fletcher

.circleci/config.yml

@@ -37,6 +37,7 @@ jobs:
       - run: date +%s > VERSION
       - run: cat VERSION
       - run: bazel run //:deploy-pip -- test $PYPI_TEST_SERVER_USERNAME $PYPI_TEST_SERVER_PASSWORD
+      - run: pip install --index-url https://test.pypi.org/simple/ kgcn
 
   deploy-git:
     machine: true

.gitignore

@@ -37,9 +37,6 @@ venv/
 # Python cache files
 __pycache__/
 
-# Python init files
-__init__.py
-
 # Model outputs
 out/