Create tmp/cache directory on git checkout
Create tmp/cache directory on git checkout

- directory is needed to run rspec
- this solution is a bit hacky: /tmp is in gitignore and thus we add an ignored file to the repository
  (a file inside an ignored dir cannot be unignored)... we are also (already) doing this with log/.keep

quintel/etmoses,quintel/etmoses,quintel/etmoses,quintel/etmoses,quintel/etmoses