[ISSUE-3/4] Adds test container and tooling (#8)

* Adding black, isort, and flake8 to pytest

* Applying black, flake8, and isort to codebase

setup.cfg

@@ -0,0 +1,21 @@
+[tool:pytest]
+addopts = -vv --black --isort --flake8
+
+[flake8]
+max-line-length = 119
+ignore =
+    # Ignore rules which contradicts black's formatting choices:
+    * E501
+    * W503
+    * W504
+    * E266
+exclude =
+    # Exclude these files
+    comic/rarfile.py
+
+
+[tool:isort]
+line_length = 119
+indent = '    '
+multi_line_output = 3
+include_trailing_comma = 1