use cluster module to handle auto restart on death

having some problems with docker auto restarts so we will do it in the
code for now

bin/server

@@ -1,10 +1,22 @@
 #!/usr/bin/env node
 
+var cluster = require('cluster');
+var debug = require('debug')('localtunnel');
+var localenv = require('localenv');
+
+if (cluster.isMaster) {
+    cluster.on('exit', function() {
+        debug('child died, restarting');
+        cluster.fork();
+    });
+
+    cluster.fork();
+    return;
+}
+
 require('stackup');
 var log = require('bookrc');
-var localenv = require('localenv');
 var optimist = require('optimist');
-var debug = require('debug')('localtunnel');
 
 var argv = optimist
     .usage('Usage: $0 --port [num]')