test if travisci/gulp-plumber does not swallow the error if CI env is set

Author: agdolla

.travis.yml

@@ -1,4 +1,5 @@
 language: node_js
+env: CI=true
 node_js:
   - "0.10"
 script: "gulp coverage"

test/runner.html

@@ -6,7 +6,7 @@
   <link rel='stylesheet' href='../node_modules/mocha/mocha.css' />
 
   <!-- Polyfill (required by babel) -->
-  <script src='../node_modules/babel/browser-polyfill.js'></script>
+  <!--script src='../node_modules/babel-core/browser-polyfill.js'></script-->
 
   <!-- Testing libraries -->
   <script src='../node_modules/mocha/mocha.js'></script>