ENH: Add GitHub Action build and test workflow

.github/workflows/build-test.yml

@@ -0,0 +1,49 @@
+name: Build and test
+
+on: [push,pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 4
+      matrix:
+        python-version: [3.5, 3.6, 3.7]
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install --upgrade setuptools wheel
+        pip install -r requirements.txt -r requirements-dev.txt
+    - name: Install package and extension
+      run: |
+        python -m pip install -e .
+        jupyter nbextension install --py --symlink --sys-prefix itkwidgets
+        jupyter nbextension enable --py --sys-prefix itkwidgets
+        jupyter nbextension enable --py --sys-prefix widgetsnbextension
+        python -m pip install jupyterlab
+        jupyter labextension install @jupyter-widgets/jupyterlab-manager
+        jupyter labextension install ./js
+    - name: Lint with flake8
+      run: |
+        python -m pip install flake8
+        # stop the build if there are Python syntax errors or undefined names
+        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics --exclude='./js'
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics --exclude='./js'
+    - name: Test with pytest
+      run: |
+        python -m pip install pytest
+        python -m pytest --tb=long --verbose --deselect tests/test_transform_types.py::test_vtkpolydata_to_geometry
+    - name: Test package generation and installation
+      run: |
+        python setup.py sdist
+        python setup.py bdist_wheel
+        python -m pip install dist/*.whl