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/navigation_spec.ts

@@ -25,7 +25,7 @@ import {
   AuxRoute,
   AsyncRoute,
   Redirect
-} from 'angular2/src/router/route_config_decorator';
+} from 'angular2/src/router/route_config/route_config_decorator';
 
 import {TEST_ROUTER_PROVIDERS, RootCmp, compile} from './util';