Update reference.

FileSaver/FileSaver-tests.ts

@@ -1,4 +1,4 @@
-/// <reference path="fileSaver.d.ts" />
+/// <reference path="FileSaver.d.ts" />
 
 /**
  * @summary Test for "saveAs" function.
@@ -8,4 +8,4 @@ function testSaveAs() {
     var filename: string = 'hello world.txt';
     
     saveAs(data, filename);
-}
+}