package.json: udpate node-pre-gyp params host & remote_path
package.json: udpate node-pre-gyp params host & remote_path

to support overriding a host mirror for prebuilt downloads.

Fixes #1055

node-serialport/node-serialport,EmergingTechnologyAdvisors/node-serialport,node-serialport/node-serialport,node-serialport/node-serialport,EmergingTechnologyAdvisors/node-serialport,EmergingTechnologyAdvisors/node-serialport,EmergingTechnologyAdvisors/node-serialport,voodootikigod/node-serialport,voodootikigod/node-serialport,voodootikigod/node-serialport,EmergingTechnologyAdvisors/node-serialport,node-serialport/node-serialport,voodootikigod/node-serialport,node-serialport/node-serialport