title: Gulp-Shell is not executing any commands
body: <p>I'm trying to execute something using <code>gulp-shell</code>. My <code>gulfile.js</code> contains the following content:</p>
  
  <pre><code>var gulp  = require('gulp'),
      shell = require('gulp-shell');
  
  gulp.task('test', function() {
    shell(['echo test']);
  });
  </code></pre>
  
  <p>Then I run it calling <code>gulp test</code>. This is the output I get:</p>
  
  <pre><code>Using gulpfile ~/gulpfile.js
  Starting 'test'...
  Finished 'test' after 2.62 ms
  </code></pre>
  
  <p>There's no output for my echo call.</p>
  
  <p>I'm using an <code>Ubuntu 14 VM</code> that I connected to, using <code>Putty</code>.</p>
  
  <p>Anyone got an idea what's wrong?</p>