Add .gitlab-ci.yml and .coveragerc

For running the tests on our GitLab instance we need to
configure the CI. In order to automatically generate
coverage reports from running the tests, we also include a
.coveragerc file which limits the scope to the librarytrader
subdirectory.

.coveragerc

+[run]
+include = librarytrader/*

.gitlab-ci.yml

+# This file is a template, and might need editing before it works on your project.
+# Official language image. Look for the different tagged releases at:
+# https://hub.docker.com/r/library/python/tags/
+image: python:latest
+
+# Change pip's cache directory to be inside the project directory since we can
+# only cache local items.
+variables:
+  PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache"
+
+# Pip's cache doesn't store the python packages
+# https://pip.pypa.io/en/stable/reference/pip_install/#caching
+#
+# If you want to also cache the installed packages, you have to install
+# them in a virtualenv and cache it as well.
+cache:
+  paths:
+    - .cache/pip
+    - venv/
+
+before_script:
+  - python -V               # Print out python version for debugging
+  - pip install virtualenv
+  - virtualenv venv
+  - source venv/bin/activate
+
+test:
+  stage: test
+  script:
+    - pip install .
+    - pip install coverage coverage-badge
+    # Workaround for buggy pip installation of capstone
+    - PYVER=$(python --version 2>&1 | sed -e 's/\ //g' -e 's/P/p/g' | cut -c1-9); WRONGFILE="./venv/lib/$PYVER/site-packages/$PWD/venv/lib/$PYVER/site-packages/capstone/libcapstone.so"; TARGET="./venv/lib/$PYVER/site-packages/capstone"; if [ -f "$WRONGFILE" ]; then cp "$WRONGFILE" "$TARGET"; fi
+    - coverage run --concurrency=multiprocessing test/run_tests.py
+    - coverage combine
+    - coverage html
+    - coverage-badge -o htmlcov/coverage.svg
+    - coverage report
+  artifacts:
+    paths:
+      - htmlcov