Fixed scala.xml.Elem.apply deprecation warning

Fixed scala.xml.Elem.apply deprecation warning in Scala 2.10
Example of warning:
[WARNING] /storage/dev/zreader/src/main/scala/sh/oleg/zreader/snippet/TBNav.scala:88: warning: method apply in object Elem is deprecated: Use the other apply method in this object
[INFO]               Elem(ulPrefix, "ul", newUlAttribs(ulAttribs), ulScope, ulChildren: _*) ++
[INFO]               ^