Better support for the source symlinks for Windows Git users

Windows doesn't like symlinks, and so I couldn't compile the core project. As mentioned in #6 I've updated the build so that SBT will try to do symlink resolution on its own, and where it fails, it'll read the file as plain text, interpret it as a path, and use that as the resulting source directory. With this, I'm able to successfully compile the projects on my Windows box.

Also included is an update to one of the dependencies. It was broken when I found it.