Add Azure Pipelines CI (Linux and Mac only)

Windows needs to wait on a bug being fixed.

azure-pipelines.yml

@@ -0,0 +1,29 @@
+variables:
+  DENO_VERSION: 'v0.2.3'
+
+jobs:
+
+- job: 'Linux'
+  pool:
+    vmImage: 'Ubuntu-16.04'
+  steps:
+  - script: curl -L https://deno.land/x/install/install.py | python - $(DENO_VERSION)
+  - script: echo '##vso[task.prependpath]$(HOME)/.deno/bin/'
+  - script: deno test.ts --allow-run --allow-net
+
+- job: 'Mac'
+  pool:
+    vmImage: 'macOS-10.13'
+  steps:
+  - script: curl -L https://deno.land/x/install/install.py | python - $(DENO_VERSION)
+  - script: echo '##vso[task.prependpath]$(HOME)/.deno/bin/'
+  - script: deno test.ts --allow-run --allow-net
+
+# TODO Windows is broken on a bug: https://github.com/denoland/deno/issues/1384
+#- job: 'Windows'
+#  pool:
+#    vmImage: 'vs2017-win2016'
+#  steps:
+#  - powershell: iex (iwr https://deno.land/x/install/install.ps1)
+#  - script: echo '##vso[task.prependpath]C:\Users\VssAdministrator\.deno\bin\'
+#  - script: 'C:\Users\VssAdministrator\.deno\bin\deno.exe test.ts --allow-run --allow-net'