Grape will ignore a few things now

Another update to Grape: it will now ignore the doc, log, tmp and vendor/rails directories in its searches. No point crawling through the huge files that can build up in log or tmp, and doc is mostly auto-generated anyway. I have a habit of keeping large photoshop files and database backups in the doc folder too, and they can grind searches down to a halt. I figured vendor/rails was fine too as you’re probably not interested in its contents – you’re just interested in your app, and maybe the plugins.