Merge pull request #815 from santialbo/patch-3

Restangular also accepts strings as id for the method "one"

restangular/restangular.d.ts

@@ -8,6 +8,7 @@
 
 interface Restangular extends RestangularCustom {
     one(route: string, id?: number): RestangularElement;
+    one(route: string, id?: string): RestangularElement;
     all(route: string): RestangularCollection;
     copy(fromElement: any): RestangularElement;
     withConfig(configurer: any): Restangular;