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

* Adding black, isort, and flake8 to pytest

* Applying black, flake8, and isort to codebase

Pipfile

@@ -7,7 +7,9 @@ verify_ssl = true
 pdbpp = "*"
 pytest-django = "*"
 pytest-black = "*"
+pytest-cov = "*"
 pytest-flake8 = "*"
+pytest-isort = "*"
 
 [packages]
 ujson = "*"