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/util.ts

@@ -21,7 +21,7 @@ import {RootRouter} from 'angular2/src/router/router';
 import {Router, ROUTER_DIRECTIVES, ROUTER_PRIMARY_COMPONENT} from 'angular2/router';
 
 import {SpyLocation} from 'angular2/src/mock/location_mock';
-import {Location} from 'angular2/src/router/location';
+import {Location} from 'angular2/src/router/location/location';
 import {RouteRegistry} from 'angular2/src/router/route_registry';
 import {DirectiveResolver} from 'angular2/src/core/linker/directive_resolver';
 import {DOM} from 'angular2/src/platform/dom/dom_adapter';