IVYDE-329:
- DTD external fetching disabled when checking root XML tags 
- part of Ivy's XMLHelper was cloned so we can keep IvyDE requirement on Ivy lower than trunk
(thanks to Stephen Haberman)


git-svn-id: https://svn.apache.org/repos/asf/ant/ivy/ivyde/trunk@1462993 13f79535-47bb-0310-9956-ffa450edef68