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/playground/src/web_workers/router/index.ts

@@ -5,7 +5,7 @@ import {
   WORKER_SCRIPT,
   WORKER_RENDER_ROUTER
 } from 'angular2/platform/worker_render';
-import {BrowserPlatformLocation} from "angular2/src/router/browser_platform_location";
+import {BrowserPlatformLocation} from "angular2/src/router/location/browser_platform_location";
 import {MessageBasedPlatformLocation} from "angular2/src/web_workers/ui/platform_location";
 
 let ref = platform([WORKER_RENDER_PLATFORM])