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/src/web_workers/ui/platform_location.ts

@@ -1,4 +1,4 @@
-import {BrowserPlatformLocation} from 'angular2/src/router/browser_platform_location';
+import {BrowserPlatformLocation} from 'angular2/src/router/location/browser_platform_location';
 import {Injectable} from 'angular2/src/core/di';
 import {ROUTER_CHANNEL} from 'angular2/src/web_workers/shared/messaging_api';
 import {
@@ -10,7 +10,7 @@ import {bind} from './bind';
 import {LocationType} from 'angular2/src/web_workers/shared/serialized_types';
 import {MessageBus} from 'angular2/src/web_workers/shared/message_bus';
 import {EventEmitter, ObservableWrapper, PromiseWrapper} from 'angular2/src/facade/async';
-import {UrlChangeListener} from 'angular2/src/router/platform_location';
+import {UrlChangeListener} from 'angular2/src/router/location/platform_location';
 
 @Injectable()
 export class MessageBasedPlatformLocation {

modules/angular2/src/web_workers/ui/router_providers.ts

@@ -1,6 +1,6 @@
 import {MessageBasedPlatformLocation} from './platform_location';
 import {CONST_EXPR} from 'angular2/src/facade/lang';
-import {BrowserPlatformLocation} from 'angular2/src/router/browser_platform_location';
+import {BrowserPlatformLocation} from 'angular2/src/router/location/browser_platform_location';
 import {APP_INITIALIZER, Provider, Injector, NgZone} from 'angular2/core';
 
 export const WORKER_RENDER_ROUTER = CONST_EXPR([

modules/angular2/src/web_workers/worker/platform_location.ts

@@ -3,7 +3,7 @@ import {
   PlatformLocation,
   UrlChangeEvent,
   UrlChangeListener
-} from 'angular2/src/router/platform_location';
+} from 'angular2/src/router/location/platform_location';
 import {
   FnArg,
   UiArguments,

modules/angular2/src/web_workers/worker/router_providers.ts

@@ -1,5 +1,5 @@
 import {ApplicationRef, Provider, NgZone, APP_INITIALIZER} from 'angular2/core';
-import {PlatformLocation} from 'angular2/src/router/platform_location';
+import {PlatformLocation} from 'angular2/src/router/location/platform_location';
 import {WebWorkerPlatformLocation} from './platform_location';
 import {ROUTER_PROVIDERS_COMMON} from 'angular2/src/router/router_providers_common';