Add initial circle ci config

Let's try run the unit tests in the tljh module first

.circleci/config.yml

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+version: 2
+jobs:
+  build:
+    docker:
+      # specify the version you desire here
+      # use `-browsers` prefix for selenium tests, e.g. `3.6.1-browsers`
+      - image: circleci/python:3.6.1
+
+      # Specify service dependencies here if necessary
+      # CircleCI maintains a library of pre-built images
+      # documented at https://circleci.com/docs/2.0/circleci-images/
+      # - image: circleci/postgres:9.4
+
+    working_directory: ~/repo
+
+    steps:
+      - checkout
+
+      # Download and cache dependencies
+      - restore_cache:
+          keys:
+          - v1-dependencies-{{ checksum "setup.py" }}-{{ checksum "dev-requirements.txt" }}
+          # fallback to using the latest cache if no exact match is found
+          - v1-dependencies-
+
+      - run:
+          name: install dependencies
+          command: |
+            python3 -m venv venv
+            . venv/bin/activate
+            pip install -r dev-requirements.txt
+            pip install -e .
+
+      - save_cache:
+          paths:
+            - ./venv
+          key: v1-dependencies-{{ checksum "setup.py" }}-{{ checksum "dev-requirements.txt" }}
+
+      - run:
+          name: run tests
+          command: |
+            sudo venv/bin/py.test tests/

dev-requirements.txt

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+pytest