#357 Add Scala 2.10 support

Add support for Scala 2.10. It builds now.

Scala 2.10 is enabled by default. Ok?

Does it actually make sense to support 2.9.x?

TODO:
1) add suffix _2.10 or _2.9.3 to artefactId
2) dist.sh building both profiels
3) update documentation