Add basic testing structure

In addition to the requirements to run a test suite,
this change starts the process of migrating to a structure
where we have a callable (`pkg-update-deps`) that is
actually a symlink to a normal python file (`pkg_update_deps.py`).
This is done so that we can normally import the python file
in our unit tests, as well as potentially share some
functionality between the various callables.

Author: ChrisMacNaughton

.coveragerc

@@ -0,0 +1,3 @@
+[run]
+omit=.tox/*
+include=./*

.gitignore

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+.tox
+*.pyc
+build/
+dist/
+.local
+.coverage
+.vscode/
+# Sphinx
+doc/build
+coverage.xml

.travis.yml

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+dist: bionic
+language: python
+install:
+  - sudo apt-get install dh-python
+  - pip install tox-travis
+  - pip install codecov
+matrix:
+  include:
+    - python: 3.6
+      env: ENV=pep8,py3
+    - python: 3.7
+      env: ENV=pep8,py3
+    - python: 3.8
+      env: ENV=pep8,py3y3
+script: tox -c tox.ini -e $ENV
+after_success:
+  - codecov --verbose --gcov-glob unit_tests/*