feat: add constructors without type arguments.

As the constructed objects have an any type, the
resulting containers are assignable to any type:

    var x: Map<string, number> = new Map();

That is useful to avoid having to specify types
twice when declaration and assignment are in
different places.

modules/angular2/traceur-runtime.d.ts

@@ -45,6 +45,7 @@ interface Map<K, V> {
   size: number;
 }
 declare var Map: {
+  new (): Map<any, any>;
   new<K, V>(): Map<K, V>;
   // alexeagle: PATCHED
   new<K, V>(m: Map<K, V>): Map<K, V>;
@@ -61,6 +62,7 @@ interface Set<T> {
   size: number;
 }
 declare var Set: {
+  new (): Set<any>;
   new<T>(): Set<T>;
   // alexeagle PATCHED
   new<T>(s: Set<T>): Set<T>;