Update sbt modules, migrate to scalatest

- Update sbt/util to 1.0.0-M3
 - Update sbt/librarymanagement to 1.0.0-M2

Also, migrate the tests from specs2 to scalatest.

internal/compile-ivy/src/main/scala/sbt/compiler/ComponentCompiler.scala

@@ -7,6 +7,9 @@ package compiler
 import java.io.File
 import scala.util.Try
 import sbt.io.{ Hash, IO }
+import sbt.internal.librarymanagement._
+import sbt.librarymanagement.{ Configurations, ModuleID, ModuleInfo, Resolver, UpdateOptions, VersionNumber }
+import sbt.util.Logger
 
 object ComponentCompiler {
   val xsbtiID = "xsbti"