added/fixed headers e-i

https://github.com/borisyankov/DefinitelyTyped/issues/1570

ix.js/ix.d.ts

@@ -1,6 +1,7 @@
 // Type definitions for IxJS 1.0.6 / ix.js
 // Project: https://github.com/Reactive-Extensions/IxJS
 // Definitions by: Igor Oleinikov <https://github.com/Igorbek>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
 
 ///<reference path="l2o.d.ts"/>
 

ix.js/l2o.d.ts

@@ -1,6 +1,7 @@
 // Type definitions for IxJS 1.0.6 / l2o.js
 // Project: https://github.com/Reactive-Extensions/IxJS
 // Definitions by: Igor Oleinikov <https://github.com/Igorbek>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
 
 declare module Ix {
 	export interface Disposable {
@@ -247,4 +248,4 @@ declare module Ix {
 	}
 
 	var Enumerable: EnumerableStatic;
-}
+}