Run `npm` with `--silent` to prevent it from stalling on Windows
Run `npm` with `--silent` to prevent it from stalling on Windows

For some reason, node-gyp never exits if we run `npm` commands without
the `--silent` option. Passing `--no-progress --no-color` and/or
capturing the output of stderr and stdout doesn't help.

This will still make the npm commands fail in case something goes wrong,
and won't suppress the node-gyp output when running cargo in verbose
mode.

dherman/nanny,rustbridge/neon,neon-bindings/neon,rustbridge/neon,neon-bindings/neon,neon-bindings/neon,dherman/nanny,rustbridge/neon,rustbridge/neon,dherman/nanny,neon-bindings/neon,dherman/nanny,rustbridge/neon,rustbridge/neon