This vim plugin is a custom syntax checker for syntastic that just pulls in log files generated by the sbt-vim-async-integration sbt plugin. This plugin has no real meaning without that one.
This is in an alpha stage as of Feb '16 and while some minor kinks are worked out (like the column start being off by a few characters after running sbt scalastyle.
To make my life a bit easier, the installation instructions can be found on the [sbt-vim-async-integration][sbt plugin] page.