Upgrade to Scala 2.10.0 and SBT 0.12.1

Cross-build versions for both Scala 2.10 and Scala 2.9.2.

Signed-off-by: Aki Saarinen <aki.saarinen@valotrading.com>
Merge pull request #79 from valotrading/features/scala-2.10

Upgrade to Scala 2.10.0 and SBT 0.12.1