remove xml parsing and content-type detection from response parsing

CHANGES

@@ -8,3 +8,10 @@ Released on March 14, 2012
 
 - If no version is passed to the Services_Twilio constructor, the library will
   default to the most recent API version.
+
+Version 3.3
+-----------
+
+Use the 'Accept-Charset' header to specify we want to receive UTF-8 encoded 
+data from the Twilio API. Remove unused XML parsing logic, as the library never 
+requests XML data.

Services/Twilio.php

@@ -145,16 +145,7 @@ private function _processResponse($response)
         if (empty($headers['Content-Type'])) {
             throw new DomainException('Response header is missing Content-Type');
         }
-        switch ($headers['Content-Type']) {
-        case 'application/json':
-            return $this->_processJsonResponse($status, $headers, $body);
-            break;
-        case 'text/xml':
-            return $this->_processXmlResponse($status, $headers, $body);
-            break;
-        }
-        throw new DomainException(
-            'Unexpected content type: ' . $headers['Content-Type']);
+        return $this->_processJsonResponse($status, $headers, $body);
     }
 
     private function _processJsonResponse($status, $headers, $body) {
@@ -170,16 +161,4 @@ private function _processJsonResponse($status, $headers, $body) {
         );
     }
 
-    private function _processXmlResponse($status, $headers, $body) {
-        $decoded = simplexml_load_string($body);
-        if (200 <= $status && $status < 300) {
-            return $decoded;
-        }
-        throw new Services_Twilio_RestException(
-            (int)$decoded->Status,
-            (string)$decoded->Message,
-            (string)$decoded->Code,
-            (string)$decoded->MoreInfo
-        );
-    }
 }