fix for #596

lib/swagger-client.js

@@ -245,7 +245,7 @@ SwaggerClient.prototype.build = function() {
     }
   };
   var e = (typeof window !== 'undefined' ? window : exports);
-  e.authorizations.apply(obj);
+  var status = e.authorizations.apply(obj);
   new SwaggerHttp().execute(obj);
   return this;
 };
@@ -626,6 +626,8 @@ Operation.prototype.execute = function(arg1, arg2, arg3, arg4, parent) {
       else if (param.in === 'query') {
         if(querystring === '')
           querystring += '?';
+        else
+          querystring += '&';
         if(typeof param.collectionFormat !== 'undefined') {
           var qp = args[param.name];
           if(Array.isArray(qp))