Fix EclipseCreateSrc.Default so that it includes a project's resources

Fix for https://github.com/typesafehub/sbteclipse/issues/225. I'm not sure why resource isn't part of Default to begin with. I'm guessing this was just implemented by someone who wasn't a heavy Eclipse user and didn't think a "resource" sounded like a "source". I've never run into a situation where you wouldn't want this. We've gotten a number of bugs filed against Play Framework because of this and it's something that's frustrated me for a long time. I finally overrode sbteclipse's default in Play, so that this is now the behavior for anyone using Play, but really it should be fixed here instead.