untested: update for latest boot/tempdirs

I updated for latest boot/tempdirs stuff.  Things worth noting:

- tailrecursion/boot-useful moved to adzerk/bootlaces
- pod-pool takes keyword args and defaults to a pool size of 2
- task-options takes pairs of symbol -> map
- I 'conj' dependencies onto the user env instead of `assoc-in`. https://github.com/boot-clj/boot/wiki/Pods#creating-pods-based-on-current-env