refactor(router): rename "alias" to "as"

Author: btford

modules/angular2/src/router/route_registry.js

@@ -43,7 +43,7 @@ export class RouteRegistry {
  this.configFromComponent(component);
  });
 
- recognizer.addConfig(config['path'], config, config['alias']);
+ recognizer.addConfig(config['path'], config, config['as']);
  }
 
  configFromComponent(component) {

modules/angular2/test/router/outlet_spec.js

@@ -134,7 +134,7 @@ export function main() {
  it('should generate link hrefs', inject([AsyncTestCompleter], (async) => {
  ctx.name = 'brian';
  compile('<a href="hello" router-link="user" [router-params]="{name: name}">{{name}}</a>')
- .then((_) => rtr.config({'path': '/user/:name', 'component': UserCmp, 'alias': 'user'}))
+ .then((_) => rtr.config({'path': '/user/:name', 'component': UserCmp, 'as': 'user'}))
  .then((_) => rtr.navigate('/a/b'))
  .then((_) => {
  view.detectChanges();