MYFACES-3697: Error while parsing Facelet-Lib hides the real reason when logging
 - using the constructor to set the cause
 - using SAXParseException instead of SAXException

git-svn-id: https://svn.apache.org/repos/asf/myfaces/core/branches/2.0.x@1448211 13f79535-47bb-0310-9956-ffa450edef68