Support ZK 8 new specification: <config-name> is required in config.xml

Current known problem

1. load a blank file then the exception below occured for config.xml spec change in ZK 8.

SEVERE:
org.zkoss.util.IllegalSyntaxException: <config-name> is required ([null:jar:file:/Users/hawk/.m2/repository/org/zkoss/zss/zssex/3.8.2-Eval/zssex-3.8.2-Eval.jar!/metainfo/tld/config.xml:14:9]).
at org.zkoss.idom.util.IDOMs.getRequiredElementValue(IDOMs.java:79)
at org.zkoss.util.resource.ClassLocator$XMLResource.<init>(ClassLocator.java:141)
at org.zkoss.util.resource.ClassLocator$XMLResource.<init>(ClassLocator.java:120)
at org.zkoss.util.resource.ClassLocator.getDependentXMLResources(ClassLocator.java:79)
at org.zkoss.xel.taglib.Taglibs.getDefaultTLDs(Taglibs.java:324)
at org.zkoss.xel.taglib.Taglibs.getDefaultURL(Taglibs.java:308)
at org.zkoss.web.servlet.dsp.impl.Parser$Context.loadTaglib(Parser.java:512)
at org.zkoss.web.servlet.dsp.impl.Parser$Context.access$500(Parser.java:465)
at org.zkoss.web.servlet.dsp.impl.Parser.parseControl(Parser.java:208)