minor cleanup
simpler code for RichStream.circular
upgrade to Scala 2.10.2
upgrade to sbt 0.12.4
get Haskell solutions working with current ghc

at the moment on my system, that's ghc 7.6.3
Merge remote-tracking branch 'origin/master' into sbt-0.13

Conflicts:
	project/build.properties
use sbt 0.13 syntax in build