Fixed issue with embedded_docs and db_fields

Bumped version also
refs: hmarr/mongoengine#523

mongoengine/__init__.py

@@ -12,7 +12,7 @@ from signals import *
 __all__ = (document.__all__ + fields.__all__ + connection.__all__ +
            queryset.__all__ + signals.__all__)
 
-VERSION = (0, 6, 12)
+VERSION = (0, 6, 13)
 
 
 def get_version():

mongoengine/base.py

@@ -957,6 +957,8 @@ class BaseDocument(object):
                 try:
                     data[field_name] = (value if value is None
                                     else field.to_python(value))
+                    if field_name != field.db_field:
+                        del data[field.db_field]
                 except (AttributeError, ValueError), e:
                     errors_dict[field_name] = e
             elif field.default: