boot repl eval options not picked up using cider-jack-in

build.boot:

```
(set-env!
:source-paths #{"src"}
:dependencies '[[org.clojure/clojure "1.7.0"]])

(task-options! repl {:init-ns 'nrepl.foo
:eval '(set! *print-length* 20)})
```

Running `cider-jack-in` in Emacs and evaluating `*print-length*` => nil. Expected result: 20. When running `boot repl` and evaluating `*print-length*` we see 20. The equivalent behaviour for lein (repl-options) works with `cider-jack-in`. The problem thus seems to be between boot and CIDER.
- boot version 2.5.5
- CIDER 0.10.0snapshot

See https://github.com/clojure-emacs/cider/issues/1462 for related issue.