refactor(dart/transform): Remove index_static from hello_world

index_static.js & index_static.html are unnecessary in Js and are now
essentially generated via the Dart transformer. The angular
transformer is specified in examples/pubspec.yaml; use pub build to
create a transformed application that does not use dart:mirrors.

Create index_dynamic.js & index_dynamic.html, which are used to test
that the app runs equally well with mirrors and without.

Closes #495

gulpfile.js

@@ -355,24 +355,6 @@ gulp.task('serve/benchmarks_external.dart', pubserve(gulp, gulpPlugins, {
   path: CONFIG.dest.dart + '/benchmarks_external'
 }));
 
-gulp.task('serve/examples.dart.static', pubserve(gulp, gulpPlugins, {
-  command: DART_SDK.PUB,
-  mode: 'ngstatic',
-  path: CONFIG.dest.dart + '/examples'
-}));
-
-gulp.task('serve/benchmarks.dart.static', pubserve(gulp, gulpPlugins, {
-  command: DART_SDK.PUB,
-  mode: 'ngstatic',
-  path: CONFIG.dest.dart + '/benchmarks'
-}));
-
-gulp.task('serve/benchmarks_external.dart.static', pubserve(gulp, gulpPlugins, {
-  command: DART_SDK.PUB,
-  mode: 'ngstatic',
-  path: CONFIG.dest.dart + '/benchmarks_external'
-}));
-
 // --------------
 // doc generation
 var Dgeni = require('dgeni');