support WebAssembly MVP. Since it's not yet released
we assume its been downloaded or compiled locally
and the executable is ../node/node. According to
-[this](https://github.com/nodejs/node/issues/12090#issuecomment-289755110)
-v8.0.0 should be released by end of April 2017.
+[this](https://github.com/nodejs/node/pull/12220#issuecomment-294511442)
+v8.0.0 should be released by end on May 30th 2017.
I tested by compiling [node](https://github.com/nodejs/node)
from sources on master branch at sha1