Set up CI with Azure Pipelines

Update Azure pipelines to new syntax.

azure-pipelines.yml

@@ -1,38 +1,41 @@
-resources:
-  - repo: self
-
-phases:
-- phase: Linux
-  queue:
-    name: 'Hosted Ubuntu 1604'
-    parallel: 2
-    matrix:
-      Debug:
-        BuildType: Debug
-      Release:
-        BuildType: Release
-
-  steps:
-  - script: |
-      sudo add-apt-repository deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-8 main
-      sudo apt-get update
-      sudo apt-get install -y ninja-build clang-8
-
-
-  - task: CMake@1
-    inputs:
-      cmakeArgs: '.. -GNinja -DCMAKE_BUILD_TYPE=$(BuildType) -DTESTS=ON -DCMAKE_CXX_COMPILER=clang++-8 -DCMAKE_C_COMPILER=clang-8'
-
-  - script: |
-      ninja
-
-    workingDirectory: build
-    failOnStderr: true
-    displayName: 'Compile'
-
-  - script: |
-      ctest -j 4 --output-on-failure
-
-    workingDirectory: build
-    failOnStderr: true
-    displayName: 'Test'
+trigger:
+- master
+- 1.9
+pr:
+- master
+- 1.9
+
+jobs:
+  - job: Linux
+    displayName: Ubuntu-16.04
+    pool:
+      vmImage: ubuntu-16.04
+    strategy:
+      matrix:
+        Debug:
+          BuildType: Debug
+        Release:
+          BuildType: Release
+    steps:
+    - script: |
+        sudo add-apt-repository deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-8 main
+        sudo apt-get update
+        sudo apt-get install -y ninja-build clang-8
+
+    - task: CMake@1
+      inputs:
+        cmakeArgs: '.. -GNinja -DCMAKE_BUILD_TYPE=$(BuildType) -DTESTS=ON -DCMAKE_CXX_COMPILER=clang++-8 -DCMAKE_C_COMPILER=clang-8'
+
+    - script: |
+        ninja
+
+      workingDirectory: build
+      failOnStderr: true
+      displayName: 'Compile'
+
+    - script: |
+        ctest -j 4 --output-on-failure
+
+      workingDirectory: build
+      failOnStderr: true
+      displayName: 'Test'