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

tools/broccoli/trees/node_tree.ts

@@ -72,7 +72,7 @@ module.exports = function makeNodeTree(projects, destinationPath) {
       'angular2/test/common/forms/**',
 
       // we call browser's bootstrap
-      'angular2/test/router/route_config_spec.ts',
+      'angular2/test/router/route_config/route_config_spec.ts',
       'angular2/test/router/integration/bootstrap_spec.ts',
 
       // we check the public api by importing angular2/angular2