fix(serializer): When we recurse, be sure to bind this/self so that i…

…t is properly defined in the next step.

lib/serializer.js

@@ -230,7 +230,7 @@ Swiz.prototype.buildObjectSync = function(obj) {
   }
   else if (obj instanceof Array) {
     // Recurse onto every element of an array
-    return obj.map(self.buildObjectSync);
+    return obj.map(self.buildObjectSync.bind(this));
   }
   else if (obj instanceof Object && obj.getSerializerType) {
     // Recurse onto each property named in the definition
@@ -266,7 +266,7 @@ Swiz.prototype.buildObjectSync = function(obj) {
         }
       }
 
-      result[dst] = self.buildObjectSync(obj[src]);
+      result[dst] = self.buildObjectSync.bind(self)(obj[src]);
     });
     return result;
   }
@@ -279,7 +279,7 @@ Swiz.prototype.buildObjectSync = function(obj) {
       if (!obj.hasOwnProperty(key)) {
         return;
       }
-      result[key] = self.buildObjectSync(obj[key]);
+      result[key] = self.buildObjectSync.bind(self)(obj[key]);
     });
     return result;
   }