Handling child_process.spawn parameter "windowsVerbatimArguments"

[rebrec]

Hi and thanks for this great package which works perfectly for me when running powershell or cmd processes under Windows.

I am getting troubles when trying to run powershell with command line parameters.
It seems that by default, the spawn method sanitize arguments.

So, for instance, if i try to run the following code :

const { platform } = require('os');
const path = require('path');

const Promise = require('promise');
const StatefulProcessCommandProxy = require("stateful-process-command-proxy");

const processCommand = 'C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe'
const processArgs = ['-NoProfile', '-ExecutionPolicy bypass']


const statefulProcessCommandProxy = new StatefulProcessCommandProxy(
{
  name: "powershell",
  max: 5,
  min: 5,
  idleTimeoutMS: 10000,

  logFunction: function(severity,origin,msg) {
    console.log('                ' + severity.toUpperCase() + " " +origin+" "+ msg);
  },

  processCommand: processCommand,
  processArgs:  processArgs,
  processRetainMaxCmdHistory : 50,

  processInvalidateOnRegex :
    {
      'any':[{regex:'.*error.*',flags:'ig'}],
      'stdout':[{regex:'.*error.*',flags:'ig'}],
      'stderr':[{regex:'.*error.*',flags:'ig'}]
    },

  processCwd : path.join('.', '.'),
  processEnvMap : null,
  processUid : null,
  processGid : null,

  initCommands: null,

  validateFunction: (processProxy) => {processProxy.isValid()},
  preDestroyCommands: null
});

The powershell command which get executed is :

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -NoProfile "-ExecutionPolicy bypass"

Which return an error (Notice the double quotes on the line above which should not be present).

When modifying the following code within processProxy.js, at line 179 :

this._processOptions['windowsVerbatimArguments'] = true;

Powershell start properly with the following command line :

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -NoProfile -ExecutionPolicy bypass

Could you handle a parameter so that we can (on win32 platform) handle the spawn parameter windowsVerbatimArguments ?

I can try to do a pull request if you whish.

Regards