chore(es6-shim): Updating the gulpfile to bundle in es6-shim. Updating the webpack.config file to include the es6-shim

gulpfile.js

@@ -231,6 +231,7 @@ gulp.task('bundle.ionic', ['transpile'], function() {
   }
 
   return gulp.src([
+      'node_modules/es6-shim/es6-shim.min.js',
       'dist/src/es5/system/ionic/**/*.js'
     ])
     .pipe(concat('ionic.js'))

scripts/demos/webpack.config.js

@@ -1,5 +1,6 @@
 module.exports = {
   entry: [
+    "es6-shim",
     "zone.js",
     "reflect-metadata",
     "angular2/angular2",