Add streaming microphone sample for Speech (#87)

Add streaming microphone sample for Speech

speech/system-test/MicrophoneStream.test.js

@@ -0,0 +1,30 @@
+/**
+ * Copyright 2016, Google, Inc.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+'use strict';
+
+const path = require(`path`);
+const test = require(`ava`);
+
+const {runAsync} = require(`@google-cloud/nodejs-repo-tools`);
+const cmd = `node MicrophoneStream.js`;
+const cwd = path.join(__dirname, `..`);
+
+test(`MicrophoneStream.js Should load and display Yaaaarghs(!) correctly`, async t => {
+  const output = await runAsync(`${cmd} --help`, cwd);
+  t.true(
+    output.includes('Streams audio input from microphone, translates to text')
+  );
+});