fix for #577, added extension for default value

Author: fehguy

lib/types/operation.js

@@ -106,6 +106,13 @@ var Operation = module.exports = function (parent, scheme, operationId, httpMeth
       param['enum'] = [true, false]; // use actual primitives
     }
 
+    if(param['x-examples']) {
+      var d = param['x-examples'].default;
+      if(typeof d !== 'undefined') {
+        param.default = d;
+      }
+    }
+
     if (typeof param['enum'] !== 'undefined') {
       var id;