title: Stack creation is hanging on CREATE_IN_PROGRESS
body: <p>I have been experimenting with lambda backed custom resources.Iam trying to trigger the Lambda function with Custom Resource. On Stack creation, Custom resource is hanging on CREATE_IN_PROGRESS, but Iam able to get the email and also when trying to delete the Stack, it stucking on DELETE_IN_PROGRESS.</p>
  
  <p>Now I have five stacks hanging on DELETE_IN_PROGRESS. Where are the Custom Resources created?</p>
  
  <pre><code>     "SendEmailNotification" : {
          "Type": "AWS::Lambda::Function",
          "Properties": {
              "Handler": "index.handler",
              "Role": { "Fn::GetAtt" : ["LambdaExecutionRole", "Arn"] },
              "Code": {
                  "ZipFile":  { "Fn::Join": ["", [
                      "var aws = require('aws-sdk');\n",
                      "var response = require('cfn-response');",
                      "var ses = new aws.SES({\n",
                      "region:'us-east-1'\n",
                      "});\n",
                      "exports.handler = function(event, context) {\n",
                      "console.log('Incoming: ', event);\n",
                      "var eParams = {\n",
                      "Destination: {\n"  ,
                      {"Fn::Join" : ["",["ToAddresses: ['",{ "Ref" : "EmailId" },"']\n"]]},
                      "},\n",
                      "Message: {\n",
                      "Body: {\n",
                      "Text: {\n",
                      {"Fn::Join" : ["",["Data: '", { "Fn::ImportValue" : "DNSName" },"'\n"]]},
                      "}\n",
                      "},\n",
                      "Subject: {\n",
                      "Data: 'Route53 Hosted Zone'\n",
                      "}\n",
                      "},\n",
                      {"Fn::Join" : ["",["Source: '",{ "Ref" : "EmailId" },"'\n"]]},
                      "};\n",
                      "console.log('SENDING EMAIL');\n",
                      "var email = ses.sendEmail(eParams, function(err, data){\n",
                      "if(err) console.log(err);\n",
                      "else {\n",
                      "console.log('EMAIL SENT');\n",
                      "console.log(data);\n",
                      "console.log('EMAIL: ', email);\n",
                      "context.succeed(event);\n",
                      "response.send(event, context, response.SUCCESS);\n",
                      "}\n",
                      "});\n",
                      "};"
                  ]]}
              },
              "Runtime": "nodejs6.10"
          }
      },
      "TestResource": {
          "Type": "Custom::TestResource",
          "Properties": {
              "ServiceToken": { "Fn::GetAtt" : ["SendEmailNotification","Arn"] }
          }
      }
  </code></pre>