Keep node headers in the include path even when node-addon-api is detected?

[remyjette]

Prior to #278, headers for /include/node (or /src, /deps/v8/include, /deps/uv/include) would be included even when nan/node-addon-api were located.

Now, this seems to be an either-or situation.

My project mostly uses node-addon-api, but there's one location where we need uv.h. Could there be a way for us to specify that we do need the node headers too?

Thanks!

[Julusian]

Yeah, I am open to adding this as an opt-in thing, with some warnings about not being truely node version safe in the readme.

I don't know this code well enough yet to know if that can be defined as a parameter, or if it needs to be read from package.json