Add TypeDecorator recipe for timezone aware/UTC conversion
Add TypeDecorator recipe for timezone aware/UTC conversion

Change-Id: I59e6c76a4a53ce3782bcfc4aecdeb1b4fdd7b941
References: https://github.com/sqlalchemy/sqlalchemy/issues/4980

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