Removed the default keyword as it confuses some IDEs

See discussion in https://github.com/mozilla/localForage/issues/494

localForage/localForage.d.ts

@@ -91,6 +91,6 @@ interface LocalForage {
 }
 
 declare module "localforage" {
-    var localforage: LocalForage;
-    export default localforage;
+    export var localforage: LocalForage;
+	export default localforage;
 }