Update common.js

Add method parameter to options for overriding the proxy-outgoing HTTP-method

Author: AydinChavez

lib/http-proxy/common.js

@@ -39,7 +39,7 @@ common.setupOutgoing = function(outgoing, options, req, forward) {
     function(e) { outgoing[e] = options[forward || 'target'][e]; }
   );
 
-  outgoing.method = req.method;
+  outgoing.method = options.method || req.method;
   outgoing.headers = extend({}, req.headers);
 
   if (options.headers){