[third_party] add polymer 1.2.3

polymer_1.2.3/bower_components/promise-polyfill/Gruntfile.js

 module.exports = function(grunt) {
 
         grunt.initConfig({
                 pkg: grunt.file.readJSON('package.json'),
 
                 uglify: {
                         options: {
                                 banner: '/*! <%= pkg.name %> <%= pkg.version %> */\n'
                         },
                         dist: {
@@ skipping 20 matching lines @@
       }
     }
         });
 
         grunt.loadNpmTasks('grunt-contrib-uglify');
         grunt.loadNpmTasks('grunt-closurecompiler');
         grunt.loadNpmTasks('grunt-bytesize');
 
         grunt.registerTask('build', ['closurecompiler', 'bytesize']);
 };