Fix escaping -I includes when path contains spaces

[salomvary]

Fixes #65

[jure]

We've been hit by this issue today and were quite surprised to discover it's an ancient bug in node-gyp. Any reason why this can't be merged and #65 fixed?

[bnoordhuis]

Hadn't seen this until today but it's at best a partial fix for #65. I didn't do a full audit but things like linker paths and source lists are also affected and probably more.

[jure]

Thanks for looking at this! Unless the partial fix breaks something else, and it doesn't seem likely, perhaps it's a good step into the direction of supporting spaces in build paths? The alternative could be a clear notice somewhere in the README, noting the lack of support.

[elmagow]

Any news about this? I can't install gyp because I have a space in my hdd name

[rvagg]

@refack should we pursue this here or https://github.com/refack/GYP, I don't even know anymore

[Schwaller]

Please get this space thing fixed - super annoying if testing infrastructure contains spaces ... u know to test stability for spaces :D