Set up CI with Azure Pipelines

Update Azure pipelines to new syntax.

azure-pipelines.yml

@@ -1,24 +1,27 @@
-resources:
-  - repo: self
-
-phases:
-- phase: Linux
-  queue:
-    name: 'Hosted Ubuntu 1604'
-    parallel: 2
+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'