Fix leaflet syntax error

This type of problem (modules no longer define types) can now be fixed
with the new 0.9.1 type query syntax (e.g. "typeof <identifier>").

leaflet/leaflet.d.ts

@@ -2926,7 +2926,7 @@ declare module L {
       * This method restores the L global variale to the original value it had
       * before Leaflet inclusion, and returns the real Leaflet namespace.
       */
-    export var noConflict: () => L;
+    export var noConflict: () => typeof L;
 
     /**
       * A constant that represents the Leaflet version in use.