Need access to FT_Face pointer

[romgrk]

Hey,

I'm developing node-gtk, that binds GObject introspected library, that is mainly used in GTK projects. I'm working on Cairo integration (the GTK drawing library) and the library can handle some font libraries, amongst which freetype. However, it needs to have access to the FT_Face pointer to do its thing. Are you ok with exposing that information so that node-freetype2 can be used in conjunction with node-gtk?

If you accept I can do the work myself and open a PR, I have already a branch of node-freetype2 that works with node-gtk.

Relevant PR: romgrk/node-gtk#93

Thanks