title: grunt Warning Task "watch" not found
body: <p>Gruntfile.js:</p>
  
  <pre><code>grunt.initConfig({
   watch: {
    compass: {
      files: [
        'app/styles/**/*.{scss,sass}'
      ],
      tasks: 'compass reload'
    },
  .....
  grunt.registerTask('dev', 'watch');
  </code></pre>
  
  <p>when i run </p>
  
  <pre><code>grunt dev 
  </code></pre>
  
  <p>i get the error</p>
  
  <pre><code>Warning: Task "watch" not found. Use --force to continue. 
  </code></pre>
  
  <p>I use grunt-cli v0.1.6  and grunt v0.4.0, grunt-contrib-watch is installed. </p>