feat(router): add regex matchers

@petebacondarwin deserves credit for most of this commit.

This allows you to specify a regex and serializer function instead
of the path DSL in your route declaration.

```
@RouteConfig([
  { regex: '[a-z]+.[0-9]+',
    serializer: (params) => `{params.a}.params.b}`,
    component: MyComponent }
])
class Component {}
```

Closes #7325
Closes #7126

modules/angular2/test/router/integration/impl/aux_route_spec_impl.ts

@@ -19,7 +19,12 @@ import {By} from 'angular2/platform/common_dom';
 import {provide, Component, Injector, Inject} from 'angular2/core';
 
 import {Router, ROUTER_DIRECTIVES, RouteParams, RouteData, Location} from 'angular2/router';
-import {RouteConfig, Route, AuxRoute, Redirect} from 'angular2/src/router/route_config_decorator';
+import {
+  RouteConfig,
+  Route,
+  AuxRoute,
+  Redirect
+} from 'angular2/src/router/route_config/route_config_decorator';
 
 import {specs, compile, TEST_ROUTER_PROVIDERS, clickOnElement, getHref} from '../util';
 import {BaseException} from 'angular2/src/facade/exceptions';