Fix offline tests by adjusting deps
add logDownloadUrls sbt task

This is just pure lazy to make it easy to cut-and-paste the download
links.
Merge pull request #328 from typesafehub/wip/havocp-log-download-urls

add logDownloadUrls sbt task
Merge pull request #327 from typesafehub/fix/havocp-offline-tests

Fix offline tests by adjusting deps
Merge branch 'master' of github.com:typesafehub/activator into wip/statsd