Set up CI with Azure Pipelines

azure-pipelines.yml

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+trigger:
+  batch: true
+  branches:
+    include:
+    - '*'
+    exclude:
+    - 'spacy.io'
+
+jobs:
+
+- job: 'Test'
+  strategy:
+    matrix:
+      Python27Linux:
+        imageName: 'ubuntu-16.04'
+        python.version: '2.7'
+      Python27Mac:
+        imageName: 'macos-10.13'
+        python.version: '2.7'
+      Python35Linux:
+        imageName: 'ubuntu-16.04'
+        python.version: '3.5'
+      Python35Windows:
+        imageName: 'vs2017-win2016'
+        python.version: '3.5'
+      Python35Mac:
+        imageName: 'macos-10.13'
+        python.version: '3.5'
+      Python36Linux:
+        imageName: 'ubuntu-16.04'
+        python.version: '3.6'
+      Python36Windows:
+        imageName: 'vs2017-win2016'
+        python.version: '3.6'
+      Python36Mac:
+        imageName: 'macos-10.13'
+        python.version: '3.6'
+      Python37Linux:
+        imageName: 'ubuntu-16.04'
+        python.version: '3.7'
+      Python37Windows:
+        imageName: 'vs2017-win2016'
+        python.version: '3.7'
+      Python37Mac:
+        imageName: 'macos-10.13'
+        python.version: '3.7'
+    maxParallel: 4
+  pool:
+    vmImage: $(imageName)
+
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '$(python.version)'
+      architecture: 'x64'
+
+  - script: flake8 . --count --exclude=spacy/compat.py,spacy/lang --select=E901,E999,F821,F822,F823 --show-source --statistics
+    displayName: 'flake8'
+
+  - script: |
+      python -m pip install --upgrade pip
+      pip install -r requirements.txt
+    displayName: 'Install dependencies'
+
+  - script:
+      python setup.py build_ext --inplace 
+      pip install -e .
+    displayName: 'Build and install'
+
+  - script: python -m pytest --tb=native spacy
+    displayName: 'Run tests'