title: grunt says no "sass" targets found
body: <p>I'm trying to set up grunt-contrib-sass so I can use grunt to handle sass-to-css compiling. I installed after scaffolding a basic grunt file with <code>grunt init:makefile</code>.  When I ran <code>grunt sass</code> just to test stuff, Terminal returns a "no "sass" targets found."</p>
  
  <p>My setup:</p>
  
  <ul>
  <li><p>$sass -v returns "Sass 3.2.1"</p></li>
  <li><p>$ruby -v returns "ruby 1.9.3p194"</p></li>
  <li><p>the 'node_modules' folder contains 'grunt-contrib-sass'</p></li>
  <li><p>based on the grunt-contrib-sass docs, my grunt.js file currently looks like this:</p></li>
  </ul>
  
  <pre class="lang-js prettyprint-override"><code>module.exports = function(grunt) {
  
  grunt.initConfig({
  lint: {
    files: ['grunt.js', 'lib/**/*.js', 'test/**/*.js']
  },
  test: {
    files: ['test/**/*.js']
  },
  watch: {
    files: '&lt;config:lint.files&gt;',
    tasks: 'lint test'
  },
  jshint: {
    options: {
      curly: true,
      eqeqeq: true,
      immed: true,
      latedef: true,
      newcap: true,
      noarg: true,
      sub: true,
      undef: true,
      boss: true,
      eqnull: true
    },
    globals: {},
     sass: {                                     // Task
      dist: {                                 // Target
          files: {                            // Dictionary of files
              'main.css': 'main.scss',        // 'destination': 'source'
              'widgets.css': 'widgets.scss'
          }
      },
      dev: {                                  // Another target
          options: {                          // Target options
              style: 'expanded'
          },
          files: {
              'main.css': 'main.scss',
              'widgets.css': [
                  'button.scss',
                  'tab.scss',
                  'debug.scss'                
              ]
          }
      }
  }
  }
  });
  grunt.loadNpmTasks('grunt-contrib-sass');
  
  grunt.registerTask('default', 'lint sass');
  
  };
  </code></pre>
  
  <p>Any and all help is appreciated...thanks much!</p>