update for boot 2.0.0-rc1 "tempdirs"

- pod/eval-in => pod/with-eval-in
- seed the worker pod with (core/get-env) + #'pandeiro.http/deps
- the event object is now a Fileset, which with-pre-wrap must explicitly
  accept and return
Merge pull request #2 from alandipert/master

update for boot 2.0.0-rc1 "tempdirs"