Fix uuid

Author: sidneys

lib/pbxProject.js

@@ -401,7 +401,7 @@ pbxProject.prototype.addPbxGroup = function(filePathsArray, name, path, sourceTr
 pbxProject.prototype.addToPbxProjectSection = function(target) {
 
     var newTarget = {
-            value: target.pbxNativeTarget,
+            value: target.uuid,
             comment: pbxNativeTargetComment(target.pbxNativeTarget)
         };