package.json: Update gnode to 0.1.0

this patch allows duo-test(1) to run on node 0.10.  currently, when
invoking duo-test, you just get a `"SyntaxError: Unexpected
identifier"` exception and a crash.

gnode's downstream dependency "regenerator" changed its API
drastically, which broke gnode.  the latest version compensates for the
API change, and pins a working version of regenerator.