reflected unicode column names used as keyword args

TypeError: execute() parameters must be strings

reflecting tables from postgresql so column names are unicode strings
using polymorphic loading
convert_unicode=(True|False) had no effect

this patch fixes it for me but other places where reflected strings are used as kwarg keys will cause the same problem

--- mapper.py   (revision 3314)
+++ mapper.py   (working copy)
@@ -1560,7 +1560,7 @@

             params = {}
             for c in param_names:
-                params[c.name](c.name) = self.get_attr_by_column(instance, c)
+                params[str(c.name)](str(c.name)) = self.get_attr_by_column(instance, c)
             row = selectcontext.session.connection(self).execute(statement, **params).fetchone()
             self.populate_instance(selectcontext, instance, row, isnew=False, instancekey=identitykey, ispostselect=True)

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