add new API Gateway screenshots

Author: Sunil Mallya

README.md

@@ -117,9 +117,8 @@ create the API Gateway and Lambda resources
 
  More on [Intergration Requests](http://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-mapping-template-reference.html).
  `$input.params()` parse the request object for the corresponding variable and allows the mapping template to build a JSON object. 
-    [Screenshot](https://s3-us-west-2.amazonaws.com/mauerbac-hosting/intergration.png)  
+    [Screenshot](https://s3.amazonaws.com/smallya-useast-1/twilio-apig/integration_request.png)
 5.  Let's ensure the response is correct. Twilio requires valid XML. Change the response model for 200 to Content-type: `application/xml`. Leave models empty. 
-    [Screenshot](https://s3-us-west-2.amazonaws.com/mauerbac-hosting/response.png)  
 6. Lambda cannot return proper XML, so API Gateway needs to build this. This is done in Integration response as another mapping template. This time we want to create Content-type: application/xml and template: 
 
 ```
@@ -133,7 +132,7 @@ create the API Gateway and Lambda resources
     </Message>
 </Response> 
 ```
-Our Lambda function solely returns a string of the SMS body. Here we build the XML object and use `$inputRoot` as the string.     [Screenshot](https://s3-us-west-2.amazonaws.com/mauerbac-hosting/responseModel.png)  
+Our Lambda function solely returns a string of the SMS body. Here we build the XML object and use `$inputRoot` as the string.
 7. Now let's deploy this API, so we can test it! Click the Deploy API button.
 
 ###Connecting the dots & Testing