Scala 2.10.0

Moved the project to scala 2.10.0. Changes are:
- akka 2.0.3 → 2.1.0
- spray 1.0-M1 → 1.1-M7
For now the repl subproject is commented out, as scala reflection api changed very much since the introduction of macros.
Some discussion on the ML: https://groups.google.com/forum/?fromgroups=#!topic/spark-developers/kauDJdR0rYQ