old_contents: module.exports = function (grunt, options) {
      "use strict";
  
      return {
          "styles": {
              files: [ '<%= pkg.directories.client %>/less/**/*.less' ],
              tasks: [
                  'styles'
              ]
          },
          "assets": {
              files: [
                  '<%= pkg.directories.client %>/bower_components/**',
                  '<%= pkg.directories.client %>/assets/**',
                  '<%= pkg.directories.client %>/**/*.html'
              ],
              tasks: [
                  'assets'
              ]
          }
      };
  };
new_contents: module.exports = function (grunt, options) {
      "use strict";
  
      return {
          "styles": {
              files: [ '<%= pkg.directories.client %>/less/**/*.less' ],
              tasks: [
                  'styles'
              ],
              options: {
                  'interrupt': true
              }
          },
          "assets": {
              files: [
                  '<%= pkg.directories.client %>/bower_components/**',
                  '<%= pkg.directories.client %>/assets/**',
                  '<%= pkg.directories.client %>/**/*.html'
              ],
              tasks: [
                  'assets'
              ],
              options: {
                  'interrupt': true
              }
          }
      };
  };
subject: Make the watcher interrupt when new files are found