Ajax: Don't throw exceptions on binary data response

Fixes gh-2498
Closes gh-2682

The added unit test shows how this could be used to support an
ArrayBuffer return, but $.ajax does not support it natively.
The goal with this change was to avoid the exception.

src/ajax/xhr.js

@@ -97,12 +97,13 @@ jQuery.ajaxTransport( function( options ) {
 									xhrSuccessStatus[ xhr.status ] || xhr.status,
 									xhr.statusText,
 
-									// Support: IE9
-									// Accessing binary-data responseText throws an exception
-									// (#11426)
-									typeof xhr.responseText === "string" ? {
-										text: xhr.responseText
-									} : undefined,
+									// Support: IE9 only
+									// IE9 has no XHR2 but throws on binary (trac-11426)
+									// For XHR2 non-text, let the caller handle it (gh-2498)
+									( xhr.responseType || "text" ) !== "text"  ||
+									typeof xhr.responseText !== "string" ?
+										{ binary: xhr.response } :
+										{ text: xhr.responseText },
 									xhr.getAllResponseHeaders()
 								);
 							}