Update to latest minor releases of dependencies

This is an update to the latest minor releases of all dependencies.

The new versions are:
sbt: 0.13.6
scalatest: 2.1.7
scalacheck: 1.11.6

For Scala 2.11 only:
scala: 2.11.4
scala-parser-combinators: 1.0.2

For Scala 2.10 only:
paradise: 2.0.1
quasiquotes: 2.0.1