Add azure-pipelines config

.azure-pipelines.yml

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+trigger:
+  - master
+
+pr:
+  branches:
+    include:
+      - master
+
+jobs:
+  - job: Windows
+    pool:
+      vmImage: vs2017-win2016
+    steps:
+      - template: ci/azure-install-rust.yml
+      - template: ci/azure-test-all.yml
+    strategy:
+      matrix:
+        stable:
+          TOOLCHAIN: stable
+        nightly:
+          TOOLCHAIN: nightly
+
+  - job: Linux
+    pool:
+      vmImage: ubuntu-16.04
+    steps:
+      - template: ci/azure-install-rust.yml
+      - template: ci/azure-test-all.yml
+    strategy:
+      matrix:
+        stable:
+          TOOLCHAIN: stable
+        nightly:
+          TOOLCHAIN: nightly
+
+  - job: MacOS
+    pool:
+      vmImage: macOS-10.14
+    steps:
+      - template: ci/azure-install-rust.yml
+      - template: ci/azure-test-all.yml
+    strategy:
+      matrix:
+        stable:
+          TOOLCHAIN: stable
+        nightly:
+          TOOLCHAIN: nightly

ci/azure-install-rust.yml

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+steps:
+  - bash: |
+      set -e -x
+      curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain $TOOLCHAIN
+      source $HOME/.cargo/env
+      echo "##vso[task.prependpath]$HOME/.cargo/bin"
+      rustup --version
+    displayName: Install rustup
+    condition: eq(variables['Agent.OS'], 'Darwin')
+#  - script: |
+#      echo %TOOLCHAIN%
+#      curl -sSf -o rustup-init.exe https://win.rustup.rs
+#      rustup-init.exe -v -y --default-toolchain %TOOLCHAIN%
+#      echo ##vso[task.prependpath]%USERPROFILE%\.cargo\bin
+#      rustup default %TOOLCHAIN%
+#      rustup component add rustfmt
+#    displayName: Install rust (windows)
+#    condition: eq(variables['Agent.OS'], 'Windows_NT')
+  - bash: |
+      set -x
+      rustup --version
+      rustup component remove --toolchain $TOOLCHAIN rust-docs || true
+      rustup default $TOOLCHAIN
+      rustup update --no-self-update $TOOLCHAIN
+      rustup toolchain install stable
+      rustup component add rustfmt --toolchain stable
+    displayName: Configure rust
+  - bash: |
+      set -x
+      rustc -Vv
+      cargo -Vv
+      cargo +stable fmt --version
+    displayName: Query rustc, cargo, and rustfmt versions

ci/azure-test-all.yml

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+steps:
+  - bash: |
+      set -e -x
+      cargo +stable fmt --all -- --check
+    displayName: Check formatting
+  - bash: |
+      set -e -x
+      cargo test --no-run
+    displayName: Build everything
+    env:
+      RUST_BACKTRACE: 1
+      CARGO_INCREMENTAL: 0
+  - bash: |
+      set -e -x
+      cargo test
+    displayName: Run unit tests
+    env:
+      RUST_BACKTRACE: 1
+      CARGO_INCREMENTAL: 0