refactor(build): simplify and modularize

simplify:
- use same html file for dart and JS
- build benchmarks automatically when doing `gulp build`
- centralize configuration

modularize:
- move all build tasks into separate node.js modules under
  `tools/build`.

changes:
- the `build` folder is now the `dist` folder

Closes #284

modules/benchmarks/src/element_injector/benchmark.dart

@@ -1,23 +0,0 @@
-library element_injector_benchmark;
-
-import './instantiate_benchmark.dart' as ib;
-import './instantiate_benchmark_codegen.dart' as ibc;
-import './instantiate_directive_benchmark.dart' as idb;
-import 'dart:js' as js;
-
-main () {
-  js.context['benchmarkSteps'].add(new js.JsObject.jsify({
-      "name": "ElementInjector.instantiate + instantiateDirectives",
-      "fn": new js.JsFunction.withThis((_) => ib.run())
-  }));
-
-  js.context['benchmarkSteps'].add(new js.JsObject.jsify({
-      "name": "ElementInjector.instantiateDirectives",
-      "fn": new js.JsFunction.withThis((_) => idb.run())
-  }));
-
-  js.context['benchmarkSteps'].add(new js.JsObject.jsify({
-      "name": "ElementInjector.instantiate + instantiateDirectives (codegen)",
-      "fn": new js.JsFunction.withThis((_) => ibc.run())
-  }));
-}

modules/benchmarks/src/element_injector/benchmark.es5

@@ -1,11 +0,0 @@
-System.import('benchmarks/element_injector/instantiate_benchmark').then(function (bm) {
-  window.benchmarkSteps.push({name: 'ElementInjector.instantiate + instantiateDirectives', fn: bm.run});
-}, console.log.bind(console));
-
-System.import('benchmarks/element_injector/instantiate_directive_benchmark').then(function (bm) {
-  window.benchmarkSteps.push({name: 'ElementInjector.instantiateDirectives', fn: bm.run});
-}, console.log.bind(console));
-
-System.import('benchmarks/element_injector/instantiate_benchmark_codegen').then(function (bm) {
-  window.benchmarkSteps.push({name: 'ElementInjector.instantiate + instantiateDirectives (codegen)', fn: bm.run});
-}, console.log.bind(console));

modules/benchmarks/src/element_injector/bp.conf.es5

@@ -1,11 +0,0 @@
-module.exports = function(config) {
-  config.set({
-    scripts: [
-      {src: '/js/traceur-runtime.js'},
-      {src: '/js/es6-module-loader-sans-promises.src.js'},
-      {src: '/js/extension-register.js'},
-      {src: 'register_system.js'},
-      {src: 'benchmark.js'}
-    ]
-  });
-};

modules/benchmarks/src/element_injector/main.html

@@ -0,0 +1 @@
+$SCRIPTS$

modules/benchmarks/src/element_injector/main.js

@@ -0,0 +1,19 @@
+import * as instantiate_benchmark from './instantiate_benchmark';
+import * as instantiate_directive_benchmark from './instantiate_directive_benchmark';
+import * as instantiate_benchmark_codegen from './instantiate_benchmark_codegen';
+
+import {benchmark, benchmarkStep} from 'benchpress/benchpress';
+
+export function main() {
+  benchmark(`ElementInjector.instantiate + instantiateDirectives`, function() {
+    benchmarkStep('run', instantiate_benchmark.run);
+  });
+
+  benchmark(`ElementInjector.instantiateDirectives`, function() {
+    benchmarkStep('run', instantiate_directive_benchmark.run);
+  });
+
+  benchmark(`ElementInjector.instantiate + instantiateDirectives (codegen)`, function() {
+    benchmarkStep('run', instantiate_benchmark_codegen.run);
+  });
+}

modules/benchmarks/src/element_injector/register_system.es5

@@ -1,11 +0,0 @@
-System.paths = {
-  'core/*': '/js/core/lib/*.js',
-  'change_detection/*': '/js/change_detection/lib/*.js',
-  'facade/*': '/js/facade/lib/*.js',
-  'di/*': '/js/di/lib/*.js',
-  'rtts_assert/*': '/js/rtts_assert/lib/*.js',
-  'test_lib/*': '/js/test_lib/lib/*.js',
-  'benchmarks/*': '/js/benchmarks/lib/*.js',
-  'reflection/*': '/js/reflection/lib/*.js'
-};
-register(System);