src: export node_is_initialized

[zcbenz]

This gives users that using io.js as external library a chance to set node_is_initialized to true, otherwise it would impossible for them to use dynamic native modules.

[bnoordhuis]

I don't really want to export a global (before you ask: no_deprecation was a bad idea, IMO.) A function might be acceptable but it would be even better if node_is_initialized got eradicated somehow.

[zcbenz]

How about putting node_is_initialized = true at the end of node::Init instead of putting it in node::Start? So we don't need to export node_is_initialized and users using node::Init for initialization don't have to hack on Node.

[piscisaureus]

How about putting node_is_initialized = true at the end of node::Init instead of putting it in node::Start?

That seems reasonable to me.

[zcbenz]

I have updated the patch.

[cjihrig]

@piscisaureus LGTY?

[bnoordhuis]

LGTM but a comment explaining why node_is_initialized is set where it's set makes it less likely to break in a future refactoring.

[zcbenz]

I have added some comments in the code to make things clear.

[bnoordhuis]

Thanks Cheng, landed in 22e1aea.