Rewrote the data conversion logic in ajax. Should be cleaner and faster.

src/ajax.js

@@ -166,11 +166,6 @@ jQuery.extend({
 		xhr: function() {
 			return new window.XMLHttpRequest();
 		},
-		xhrResponseFields: {
-			xml: "XML",
-			text: "Text",
-			json: "JSON"
-		},
 
 		accepts: {
 			xml: "application/xml, text/xml",
@@ -195,13 +190,13 @@ jQuery.extend({
 		// 4) the catchall symbol "*" can be used
 		// 5) execution will start with transport dataType and THEN continue down to "*" if needed
 		prefilters: {},
-		
+
 		// Transports bindings
 		// 1) key is the dataType
 		// 2) the catchall symbol "*" can be used
 		// 3) selection will start with transport dataType and THEN go to "*" if needed
 		transports: {},
-		
+
 		// Checkers
 		// 1) key is dataType
 		// 2) they are called to control successful response