Converted type defs to UMD (#37)

* Update keycode.d.ts

Added all codes map props to the interface.

* Updated type def to UMD module defintion

Author: aaronbeall

keycode.d.ts renamed to index.d.ts

@@ -1,3 +1,8 @@
+export = keycode;
+export as namespace keycode;
+
+declare const keycode: Keycode;
+
 declare interface CodesMap {
   'backspace': number;
   'tab': number;
@@ -136,9 +141,3 @@ declare interface Keycode {
   aliases: AliasesMap;
   names: InverseCodesMap;
 }
-
-declare var keycode: Keycode;
-
-declare module "keycode" {
-  export = keycode;
-}