chore(dart & ts): update to beta.17

Change `ngFor=“#…”` to `ngFor=“let…` in code. All are .dart files
except for `app_component.html` which also has changes for:
- `<inpuf var-foo…`> to `<input ref-foo…>`
- `#docregion` tag name updates from var-foo to ref-foo.
- Other misc updates to minimize diffs with TS version of file,
whitespace differences were ignored.

+ Minor update to sync up Dart prose with TS prose.

+ Used
https://github.com/angular/angular/wiki/Angular-2-Dart-Transformer#resol
ved_identifiers to solve
#1033

Guide/pipes not updated as it will be rolled back to
beta.15 in PR #1220.

Author: chalin

public/docs/_examples/architecture/dart/pubspec.yaml

@@ -5,7 +5,7 @@ version: 0.0.1
 environment:
   sdk: '>=1.13.0 <2.0.0'
 dependencies:
-  angular2: 2.0.0-beta.16
+  angular2: 2.0.0-beta.17
   browser: ^0.10.0
   dart_to_js_script_rewriter: ^1.0.1
 transformers:

public/docs/_examples/attribute-directives/dart/pubspec.yaml

@@ -5,7 +5,7 @@ version: 0.0.1
 environment:
   sdk: '>=1.13.0 <2.0.0'
 dependencies:
-  angular2: 2.0.0-beta.16
+  angular2: 2.0.0-beta.17
   browser: ^0.10.0
   dart_to_js_script_rewriter: ^1.0.1
 transformers:

public/docs/_examples/dependency-injection/dart/lib/heroes/hero_list_component.dart

@@ -7,7 +7,7 @@ import 'hero_service.dart';
 @Component(
     selector: 'hero-list',
     template: '''
-      <div *ngFor="#hero of heroes">
+      <div *ngFor="let hero of heroes">
         {{hero.id}} - {{hero.name}}
         ({{hero.isSecret ? 'secret' : 'public'}})
       </div>''')

public/docs/_examples/dependency-injection/dart/lib/heroes/hero_list_component_1.dart

@@ -7,7 +7,7 @@ import 'mock_heroes.dart';
 @Component(
     selector: 'hero-list',
     template: '''
-      <div *ngFor="#hero of heroes">
+      <div *ngFor="let hero of heroes">
         {{hero.id}} - {{hero.name}}
       </div>''')
 class HeroListComponent {

public/docs/_examples/dependency-injection/dart/lib/heroes/hero_list_component_2.dart

@@ -7,7 +7,7 @@ import 'hero_service.dart';
 @Component(
     selector: 'hero-list',
     template: '''
-      <div *ngFor="#hero of heroes">
+      <div *ngFor="let hero of heroes">
         {{hero.id}} - {{hero.name}}
       </div>''')
 class HeroListComponent {

public/docs/_examples/dependency-injection/dart/pubspec.yaml

@@ -5,7 +5,7 @@ version: 0.0.1
 environment:
   sdk: '>=1.13.0 <2.0.0'
 dependencies:
-  angular2: 2.0.0-beta.16
+  angular2: 2.0.0-beta.17
   browser: ^0.10.0
   dart_to_js_script_rewriter: ^1.0.1
 transformers:

public/docs/_examples/displaying-data/dart/lib/app_component.dart

@@ -17,7 +17,7 @@ final List<Hero> _heroes = [
 <h2>My favorite hero is: {{myHero.name}}</h2>
 <p>Heroes:</p>
 <ul>
-  <li *ngFor="#hero of heroes">
+  <li *ngFor="let hero of heroes">
     {{ hero.name }}
   </li>
 </ul>

public/docs/_examples/displaying-data/dart/lib/app_component_2.dart

@@ -19,7 +19,7 @@ const List<String> _heroes = const [
 <p>Heroes:</p>
 <ul>
 // #docregion li-repeater
-  <li *ngFor="#hero of heroes">
+  <li *ngFor="let hero of heroes">
     {{ hero }}
   </li>
 // #enddocregion li-repeater

public/docs/_examples/displaying-data/dart/lib/app_component_3.dart

@@ -19,7 +19,7 @@ final List<Hero> _heroes = [
 <h2>My favorite hero is: {{myHero.name}}</h2>
 <p>Heroes:</p>
 <ul>
-  <li *ngFor="#hero of heroes">
+  <li *ngFor="let hero of heroes">
     {{ hero.name }}
   </li>
 </ul>'''

public/docs/_examples/displaying-data/dart/pubspec.yaml

@@ -5,7 +5,7 @@ version: 0.0.1
 environment:
   sdk: '>=1.13.0 <2.0.0'
 dependencies:
-  angular2: 2.0.0-beta.16
+  angular2: 2.0.0-beta.17
   browser: ^0.10.0
   dart_to_js_script_rewriter: ^1.0.1
 transformers: