src: set node_is_initialized in node::Init
src: set node_is_initialized in node::Init

This can make node_is_initialized correctly set to true for applications
that use node::Init to embed iojs.

PR-URL: https://github.com/iojs/io.js/pull/225/
Reviewed-By: Ben Noordhuis <59bd0a3ff43b32849b319e645d4798d8a5d1e889@bnoordhuis.nl>

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node