Use text_type, not unicode
Use text_type, not unicode

Revise the fix from 03560c4b83308719067ec635662c35f9a437fb7f
to use compat.text_type for py3k compatibility

Change-Id: Ia6807bd4de3bba4b33b5327a1be7e728b45eb093

graingert/sqlalchemy,wujuguang/sqlalchemy,zzzeek/sqlalchemy,sqlalchemy/sqlalchemy,j5int/sqlalchemy,monetate/sqlalchemy,graingert/sqlalchemy,monetate/sqlalchemy,wujuguang/sqlalchemy,j5int/sqlalchemy