Swiched from PAHO to AWS IoT SDK, added Cognito authorization

mqttSample/README

@@ -1 +1,3 @@
 Be sure to serve the files from a web service. Opening index.html from local file system will not work when establishing the WebSocket connection.
+
+This example uses AWS IoT Device SDK for Node.js and from https://github.com/aws/aws-iot-device-sdk-js, which includes a script to make it browser-compatible and AWS SDK bundle which can be built here https://sdk.amazonaws.com/builder/js/ and only requires AWS.CognitoIdentity and AWS.Iot functionality.

mqttSample/bower.json

@@ -16,10 +16,7 @@
     "tests"
   ],
   "dependencies": {
-    "paho-mqtt-js": "~1.0.1",
-    "angular": "~1.4.8",
-    "bootstrap": "~3.3.6",
-    "moment": "momentjs#~2.11.1",
-    "cryptojslib": "~3.1.2"
+    "angular": "~1.6.1",
+    "bootstrap": "~3.3.6"
   }
 }