title: Node.js/Grunt - Can't run Grunt's watch - why?
body: <p>I am trying to use the autoprefixer css post-processor. I am following a tutorial and have installed npm. Using a npm, I then installed grunt and autoprefixer inside my project root using that <code>package.json</code> file: <a href="https://github.com/nDmitry/grunt-autoprefixer/blob/master/package.json" rel="nofollow noreferrer">https://github.com/nDmitry/grunt-autoprefixer/blob/master/package.json</a></p>
  <p>Following the tutorial, I then created this <code>Gruntfile.js</code> inside my project root:</p>
  <pre><code>module.exports = function (grunt) {
      grunt.initConfig({
          autoprefixer: {
              dist: {
                  files: {
                      'build/style.css': 'style.css'
                  }
              }
          },
          watch: {
              styles: {
                  files: ['style.css'],
                  tasks: ['autoprefixer']
              }
          }
      });
      grunt.loadNpmTasks('grunt-autoprefixer');
      grunt.loadNpmTasks('grunt-contrib-watch');
  };
  </code></pre>
  <p>After that the tutorial advises to use Grunt Watch using</p>
  <pre><code>./node_modules/.bin/grunt watch
  </code></pre>
  <p>Which results in</p>
  <pre><code>-bash: ./node_modules/.bin/grunt: No such file or directory
  </code></pre>
  <p>I also tried to navigate to the grunt folder inside my project, then it says</p>
  <pre><code>-bash: node_modules/grunt: is a directory
  </code></pre>
  <p>I also have a <code>node_modules</code> folder directly in my local user folder, but addressing that folder grunt also just tells me that its a folder.</p>
  <p>Pleaser help me, why is this not working? I am willing to really learn grunt, but I am not even able to get started using the getting started guide...</p>