Added BreadcrumbRouterService to public_api to allow ability to provide or override it's functionlity in a modules providers section

Author: Joel

package-lock.json

@@ -2,4 +2,5 @@ export { IBreadcrumbItem } from './breadcrumb-item/breadcrumb-item';
 export { BreadcrumbItemComponent } from './breadcrumb-item/breadcrumb-item.component';
 export { BreadcrumbComponent } from './breadcrumb/breadcrumb.component';
 export { BreadcrumbRouterComponent } from './breadcrumb-router/breadcrumb-router.component';
+export { BreadcrumbRouterService } from './breadcrumb-router/breadcrumb-router.service';
 export { BreadcrumbModule } from './breadcrumb.module';