title: 'Use of const in strict mode' error while trying gulp build for installing Semantic UI
body: <p>I am trying to install Semantic UI on ubuntu. I was following the commands on the official site but when i try to </p>
  
  <pre><code>gulp build
  </code></pre>
  
  <p>it doesn't complete the installation, instead gives out the following error :</p>
  
  <pre><code>/home/krash/node_modules/gulp-chmod/index.js:2
  const through = require('through2');
  ^^^^^
  SyntaxError: Use of const in strict mode.
      at Module._compile (module.js:439:25)
      at Object.Module._extensions..js (module.js:474:10)
      at Module.load (module.js:356:32)
      at Function.Module._load (module.js:312:12)
      at Module.require (module.js:364:17)
      at require (module.js:380:17)
      at Object.&lt;anonymous&gt; (/home/krash/semantic/tasks/watch.js:14:18)
      at Module._compile (module.js:456:26)
      at Object.Module._extensions..js (module.js:474:10)
      at Module.load (module.js:356:32)
  </code></pre>
  
  <p>I tried </p>
  
  <pre><code> gulp build --harmony
  </code></pre>
  
  <p>as it was mentioned on some other answer with a similar error, it gave out  another error</p>
  
  <pre><code>/home/krash/node_modules/gulp-chmod/index.js:6
  const defaultMode = 0o777 &amp; (~process.umask());
                  ^
  SyntaxError: Unexpected token ILLEGAL
      at Module._compile (module.js:439:25)
      at Object.Module._extensions..js (module.js:474:10)
      at Module.load (module.js:356:32)
      at Function.Module._load (module.js:312:12)
      at Module.require (module.js:364:17)
      at require (module.js:380:17)
      at Object.&lt;anonymous&gt; (/home/krash/semantic/tasks/watch.js:14:18)
      at Module._compile (module.js:456:26)
      at Object.Module._extensions..js (module.js:474:10)
      at Module.load (module.js:356:32)
  </code></pre>
  
  <p>What am i doing wrong? </p>