Latest struts2 renamed regex validator param from 'expression' to 'regex'

git-svn-id: https://svn.apache.org/repos/asf/continuum/trunk@1489426 13f79535-47bb-0310-9956-ffa450edef68
Bumping to latest struts2 version in atlassian's repo

git-svn-id: https://svn.apache.org/repos/asf/continuum/trunk@1489427 13f79535-47bb-0310-9956-ffa450edef68
Re-enabled error copying for chained actions.

git-svn-id: https://svn.apache.org/repos/asf/continuum/trunk@1489428 13f79535-47bb-0310-9956-ffa450edef68