Support for Scala 2.11.2.
Small changes to help browsing scala reference sources
Merge pull request #536 from marcsaegesser/2.11.2-Dev

Support for Scala 2.11.2.
persist the ivy cache in dropbox
Merge pull request #541 from fommil/travis_ivy

persist the ivy cache in dropbox
Merge pull request #539 from edani/load-libs

Small changes to help browsing scala reference sources
coverage must >= 40%