Cleaned up to cross compile with 2.10 and 2.11. Removed sbt-launch.jar and replaced sbt script with something that downloads sbt-launch.jar automatically thus not requiring to be committed on each update.
Merge pull request #135 from fbettag/scala_2.11

Cleaned up to cross compile with 2.10 and 2.11. Removed sbt-launch.jar a...