Fix compatibility with newest NAN.
Fix compatibility with newest NAN.

beni55/contextify,brianmcd/contextify,beni55/contextify,szarouski/contextify,szarouski/contextify,brianmcd/contextify,unitecontrol/contextify,szarouski/contextify,narma/contextify,beni55/contextify,unitecontrol/contextify,brianmcd/contextify,unitecontrol/contextify,narma/contextify,narma/contextify