Add Cloud Functions Slack (Slash Command) sample. (#151)

* Add Cloud Functions Slack Slash Command sample.

* Couple of fixes.

* Update Readme.

* Small fixes.

* Add tests for Slack sample.

* Make lint happy.

* Make lint happy.

Author: jmdobry

handwritten/datastore/samples/concepts.js

@@ -165,33 +165,33 @@ Entity.prototype.testEntityWithParent = function (callback) {
 Entity.prototype.testProperties = function (callback) {
   // jshint camelcase:false
   // [START properties]
-  var task  =  [
-      {
-        name: 'type',
-        value: 'Personal'
-      },
-      {
-        name: 'created',
-        value: new Date()
-      },
-      {
-        name: 'done',
-        value: false
-      },
-      {
-        name: 'priority',
-        value: 4
-      },
-      {
-        name: 'percent_complete',
-        value: 10.0
-      },
-      {
-        name: 'description',
-        value: 'Learn Cloud Datastore',
-        excludeFromIndexes: true
-      }
-    ];
+  var task = [
+    {
+      name: 'type',
+      value: 'Personal'
+    },
+    {
+      name: 'created',
+      value: new Date()
+    },
+    {
+      name: 'done',
+      value: false
+    },
+    {
+      name: 'priority',
+      value: 4
+    },
+    {
+      name: 'percent_complete',
+      value: 10.0
+    },
+    {
+      name: 'description',
+      value: 'Learn Cloud Datastore',
+      excludeFromIndexes: true
+    }
+  ];
   // [END properties]
 
   this.datastore.save({

handwritten/datastore/samples/tasks.js

@@ -72,7 +72,7 @@ function addTask (description, callback) {
 
   datastore.save({
     key: taskKey,
-    data:  [
+    data: [
       {
         name: 'created',
         value: new Date().toJSON()