* chore(ng2/dart): update from beta.1x to beta.18
Update made to all `pubspec.yaml` files and to relevant prose.
Note that pipes was back a beta.15; the rest were at beta.17.
* chore(pipes/dart): update ngFor microsyntax and transform method param
Updates to pipe example source code:
- Pipe `transform()` method parameters
- `ngFor` microsyntax, from `#` to `let`
- Dart code: fix issues raised by @thso during review.
- Dart code: remove "show x" clauses from imports.
- Dart add docsync config file.
- Prose: make consistent use of _Http variables; otherwise use "HTTP".
- Prose: add links to the demos list.
* _heroesUrl as static const
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
https://github.com/angular/angular.io/issues/1033
Guide/pipes not updated as it will be rolled back to
beta.15 in PR #1220.
Also update dart_to_js_script_rewriter dependency to ^1.0.1,
and change most angular2.dart imports to be core.dart instead.
The pipes example broke without the angular2.dart import, so I let it be.
The server-communication sample has never worked for me,
so I changed it but might have broken it further.
closes#1007
