Added travis config to run the test suite

Author: jimc404

.travis.yml

@@ -0,0 +1,53 @@
+language: python
+
+
+matrix:
+  include:
+    - os: linux
+      python: 3.5
+    - os: linux
+      python: 3.6
+    - os: linux
+      python: 3.7
+    - os: linux
+      python: 3.8
+    - os: osx
+      language: generic
+      env: PYTHON_VERSION=3.6.0
+    - os: osx
+      language: generic
+      env: PYTHON_VERSION=3.7.0
+    - os: osx
+      language: generic
+      env: PYTHON_VERSION=3.8.0
+
+
+install:
+  - |
+    # Manually installing pyenv and the required python version as travis does not support python builds on MacOS
+    if [ "$TRAVIS_OS_NAME" == "osx" ]; then
+      brew update
+      brew install pyenv
+      eval "$(pyenv init -)"
+      pyenv install --skip-existing $PYTHON_VERSION
+      pyenv global $PYTHON_VERSION
+      pyenv shell $PYTHON_VERSION
+      pip install -U pip setuptools wheel py
+    fi
+      pip install -r requirements.txt
+
+
+script:
+    python -m pytest
+
+
+cache:
+  directories:
+    # Caching homebrew and pyenv directories to reduce build time (as they add several minutes otherwise)
+    - $HOME/Library/Caches/Homebrew
+    - /usr/local/Homebrew
+    - $HOME/.pyenv/versions
+
+
+before_cache:
+  - if [ "${TRAVIS_OS_NAME}" = "osx" ]; then brew cleanup; fi