Build with Scala 2.11.0-RC1.
Added required XML module to sbuild launcher.
Fixed private field access by upcasting.

See also https://issues.scala-lang.org/browse/SI-8426
Build with 2.11.0-RC3 + some required version bumps.
Merge branch 'master' into scala-2.11

Conflicts:
	org.sbuild.runner/SBuild.scala
Merge branch 'master' into scala-2.11
Bumped to scala 2.11.0-RC4.
Merge branch 'scala-2.11' into 'master'.
Bumped to 0.7.9010.0-8-0-M1 and use Scala 2.11.0-RC4.