Revert "Ensure calling .stop does not error if callback is not passed in"

This reverts commit ff529c8.

Author: vedharish

lib/Local.js

@@ -18,9 +18,6 @@ function Local(){
   this.doneRegex = /Press Ctrl-C to exit/i;
 
   this.start = function(options, callback){
-    if(typeof callback !== 'function')
-      callback = function(){};
-
     this.userArgs = [];
     var that = this;
     this.addArgs(options);
@@ -107,9 +104,6 @@ function Local(){
   };
 
   this.stop = function (callback) {
-    if(typeof callback !== 'function')
-      callback = function(){};
-
     if(!this.pid) return callback();
     this.opcode = 'stop';
     this.tunnel = childProcess.execFile(this.binaryPath, this.getBinaryArgs(), function(error){