Scala 2.11.x fix

Hey Eugene,

I used the g8 template today to kick off a new project, and it doesn't work out of the box because of the separation of the XML/parsing modules in Scala 2.11.x.  In addition to correcting the problem, I took the liberty to make the Scala version a g8 template parameter.  To support both 2.11.x and prior versions, I made the `libraryDependencies` setting depend on `scalaVersion` so we can add the modules only for 2.11.x.

Joe