added/fixed headers e-i

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

google.visualization/google.visualization.d.ts

@@ -1,3 +1,8 @@
+// Type definitions for Google Visualisation Apis
+// Project: https://developers.google.com/chart/
+// Definitions by: Dan Ludwig <https://github.com/danludwig>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
 declare module google {
 
     function load(visualization: string, version: string, packages: any): void;
@@ -468,4 +473,4 @@ declare module google {
 
         //#endregion
     }
-}
+}