Allow to specify location of native bindings

[JanStevens]

Hello,

I'm trying to package my application but there seems to be a hard assumption on the native bindings being located 2 directories up in a bin folder. A bit annoying to make packaged applications.

Would it be possible to allow specifying the native bindings by configuration or environment variable?

[bretambrose]

This is a reasonable feature request, and judging by the amount of people struggling with electron/react/etc... scenarios, seems like it would be a good idea. It's not likely something that we can get to internally for some time, but we could take a look at an external PR that adds support.

[bretambrose]

Consolidating in favor of #467