use npm scripts instead of node-gyp directly.
use npm scripts instead of node-gyp directly.

Signed-off-by: Nick Campbell <e31591b49bf5c9127aafb098f2b9d466891b32f9@gmail.com>

ncb000gt/node.bcrypt.js,ncb000gt/node.bcrypt.js,kelektiv/node.bcrypt.js,kelektiv/node.bcrypt.js,ncb000gt/node.bcrypt.js,kelektiv/node.bcrypt.js,ncb000gt/node.bcrypt.js,kelektiv/node.bcrypt.js,kelektiv/node.bcrypt.js