title: Error when using gulp, js-lint
body: <p>I downloaded the ros-control-center (<a href="https://github.com/pantor/ros-control-center" rel="nofollow">https://github.com/pantor/ros-control-center</a>) and I am trying to develop it for myself.
  I already did npm install, but when i run gulp i get the following errors:</p>
  
  <pre><code>[09:12:35] Using gulpfile ~/proj/ros-control-centers/gulpfile.js
  [09:12:35] Starting 'js-lint'...
  [09:12:35] Starting 'watch'...
  [09:12:35] Finished 'watch' after 12 ms
  [09:12:35] 
  
  /home/monero/proj/ros-control-centers/app/control/control.controller.js
    1:5  error  Parsing error: Unexpected token ros
  
  /home/monero/proj/ros-control-centers/app/helper/domains.service.js
    1:1  error  Parsing error: The keyword 'class' is reserved
  
  /home/monero/proj/ros-control-centers/app/helper/quaternions.service.js
    1:1  error  Parsing error: The keyword 'class' is reserved
  
  /home/monero/proj/ros-control-centers/app/parameters/parameters.directive.js
    6:15  error  Parsing error: Unexpected token (
  
  /home/monero/proj/ros-control-centers/app/navbar/navbar.directive.js
    5:15  error  Parsing error: Unexpected token (
  
  /home/monero/proj/ros-control-centers/app/settings/settings.controller.js
    1:1  error  Parsing error: The keyword 'class' is reserved
  
  /home/monero/proj/ros-control-centers/app/settings/settings.factory.js
    1:1  error  Parsing error: The keyword 'class' is reserved
  
      /home/monero/proj/ros-control-centers/app/services/service.directive.js
        6:15  error  Parsing error: Unexpected token (
  
      /home/monero/proj/ros-control-centers/app/topics/topic.directive.js
        6:15  error  Parsing error: Unexpected token (
  
  ✖ 9 problems (9 errors, 0 warnings)
  
  [09:12:35] 'js-lint' errored after 119 ms
  [09:12:35] ESLintError in plugin 'gulp-eslint'
  Message:
      Failed with 9 errors
  </code></pre>
  
  <p>This seems like a pretty basic problem, but I couldn't find any solution online to fix this problem. If anyone needs further information just let me know, and thanks in advance! </p>