title: Grunt don't concatenate css and jquery files
body: <p>Grunt should concatenate both my css and jQuery so I used this code:</p>
  
  <pre><code>module.exports = function(grunt) {
  
  
      grunt.initConfig({
          pkg: grunt.file.readJSON('package.json'),
          watch: {
              jquery: {
                  files: ['jquerytest/**/*.js'],
                  tasks: ['concat:js']
              },
              css: {
                  files: ['css/*.css'],
                  tasks: ['concat:css3']
              },
              scss:{
                  files: ['csstest/*.scss'],
                  tasks: ['compass:dist']
              }
          },
  
          concat: {
              js : {
                  options: {
                      separator: ',\n',
                      banner: 'jQuery.fn.extend({',
                      footer: '});'
                  },
                  files: {
                      src: ['jquerytest/general/MyFunJqueryLibrary.js', 'jquerytest/general/MySetJqueryLibrary.js'],
                      dest: 'jquery/MyJqueryLibrary.js'
                  },
              },
              css3 : {
                  options: {
                      separator: '\n'
                  },
                  files: {
                      src: ['css/MyLibraryCss.css', 'css/MyLibraryScss.css'],
                      dest: 'css/css.css'
                  },
              },
          },
  
          compass: {
              dist: {
                  options: {
                      sassDir: 'csstest',
                      cssDir: 'css'
                  }
              }
          }
      });
  
      grunt.loadNpmTasks('grunt-contrib-compass');
      grunt.loadNpmTasks('grunt-contrib-sass');
      grunt.loadNpmTasks('grunt-contrib-concat');
      grunt.loadNpmTasks('grunt-contrib-watch');
  
      // Default task(s).
      grunt.registerTask('concatjs', ['concat:dist1', 'concat:dist2']);
      grunt.registerTask('default', ['watch']);
  
  };
  </code></pre>
  
  <p>When running the <code>watch</code> task I get this message:</p>
  
  <pre class="lang-none prettyprint-override"><code>File "css\MyLibraryCss.css" changed.
  Running "concat:css3" (concat) task
  </code></pre>
  
  <p>but nothing happens. However, when using the jQuery concat task it works, the problem happens only when I use two tasks inside concat.</p>