Start-Sleep time variale

In VSTS.WinServices/WinServices/CreateWindowsService/createservice.ps1 make the Start-Sleep use a variable instead of hard coding this to 5 seconds.

if ($existingService) 
{
	$existingService.Delete()
	Write-Host "Waiting 5 seconds to allow service to be uninstalled."
	**Start-Sleep -s 5**  
}