restore Java6 compatibility
 - (TREQ-19) Please make the significance of underscore (_) in tiles definition filename more obvious
 - http://article.gmane.org/gmane.comp.apache.tiles.devel/681


git-svn-id: https://svn.apache.org/repos/asf/tiles/request/branches/TREQ_1_0_X@1598227 13f79535-47bb-0310-9956-ffa450edef68