Update dependency versions
- Scala 2.11.0
- SBT 0.13.2
- ScalaTest 2.1.6
- ScalaCheck 1.11.4
- sbteclipse-plugin 2.5.0
- sbt-scoverage 0.99.5
- scalastyle-sbt-plugin 0.4.0
Merge pull request #5 from hanxue/scala-2.11.0

Update dependency versions, including Scala 2.11