allow result set mappings to be embedded directly in @NamedNativeQuery

[gavinking]

and add lockMode to @EntityResult.

see #471, #472

[gavinking]

Example usage:

@NamedNativeQuery(name = “someQuery",
	query = "select TABLE_NAME as t_name, CURRENT_TIME as t_time from ALL_TABLES where TABLE_NAME = 'AUDIT_ACTIONS'“,
	entities = @EntityResult(entityClass = AllTables.class,
				fields = {
						@FieldResult(name = "tableName", column = "t_name"),
						@FieldResult(name = "daysOld", column = "t_time")
				}))

[lukasj]

LGTM