wrap workers in a function scope and add a validateMessage method to HK's Env

lib/check-signature.js

@@ -5,9 +5,7 @@ const Nacl = require('tweetnacl/nacl-fast');
 // XXX npm "os" and "child_process"
 
 // TODO if this process is using too much CPU, we can use "cluster" to add load balancing to this code
-
-console.log('New child process', process.pid);
-
+//console.log('New child process', process.pid);
 process.on('message', function (data) {
     //console.log('In process', process.pid);
     //console.log(+new Date(), "Message received by subprocess");