Revert "Use sbt launcher from paulp/sbt-extras [e3027809][1]"
Revert "Use sbt launcher from paulp/sbt-extras [e3027809][1]"

This is no longer needed since [sbt 1.0.2][1] fixes the terminal echo
issue.

This reverts commit 298a1fc277a80b72328112e8b2dacbd3dc7f163a.

[1]: https://github.com/sbt/sbt/releases/tag/v1.0.2

esamson/dotfiles,esamson/dotfiles