Update bash install

- I thought command line usage of ViM would match GUI usage, turns out I
  was wrong, switching `+x` back to `+qa`
- Attempting to fix the wrongs of QuickLook plugin installation from
  cask; it appears that I'm not creating a folder, but a file, or
  perhaps thats how it gets created, anyway, remove the file and then
  create a folder

Issue: #8