Update versions of different software

See https://github.com/travis-ci/travis-cookbooks/blob/master/changes.md
Update Scala examples
Update Gradle to 1.11
Scala 2.11.0 hit the street!
Update Erlang versions and other minor udpates
Update Haskell versions
Merge pull request #42 from travis-ci/linux-vm-update

Linux VM update (April 2014)