Added code to auto insert scala-xml jar into launching classpath when scala xml classes are not available in the original classpath, this solves the problem where 2.11 modularize xml classes into its own scala-xml jar and by default it is not included as Scala Library in Scala IDE, causing a ClassNotFoundException as ScalaTest's XmlSocketReporter is using xml classes.
Use code source to get the location of scala-xml jar for scala 2.11.
Merge pull request #30 from scalatest/2.11

Support for 2.11