title: gulp-plumber module cannot be found?
body: <p>I'm fairly new to Gulp and I can't overcome one issue.</p>
  
  <p>I need to install my dependencies globally (not locally), so I've done npm -g install &amp; also tried to install them all separately with -g flag.</p>
  
  <p>Anyway, SASS works, Coffee works, everything works, but when I run "gulp" i get:</p>
  
  <pre><code>module.js:338
      throw err;
            ^
  Error: Cannot find module 'gulp-plumber'
  </code></pre>
  
  <p>Checking if it's installed:</p>
  
  <pre><code>npm list -g gulp-plumber
  
  /usr/local/lib
  └── gulp-plumber@1.0.1 
  </code></pre>
  
  <p>Looks a-okay.</p>
  
  <p>Checking SASS the same way:</p>
  
  <pre><code>npm list -g gulp-sass
  /usr/local/lib
  └── gulp-sass@2.1.0
  </code></pre>
  
  <p>If they're both installed why my gulp "can't see" plumber alone? How do I fix that? </p>