Many linux daemons respond to the SIGHUP signal by reloading their configurations. Combined with opsdroid's no_cache: true this could be used to reload a skill (or other plugin) while developing it.

This should be added in the same manner as the existing handlers

Describe the bug
Cannot use 'cp' command while installing it on Windows.
It is needed to replace 'cp' with 'copy' in scripts written in package.json if an user wants to install botfront on Windows machine.

To Reproduce
Steps to reproduce the behavior:

1. Install choco
2. Install meteor
3. Install botfront using meteor npm install in Windows Powershell.

Expected behavior

• A new botkit controller for Slack
• Updated HTML within ThirdParty/index.js
• At least boiler code for test suites.

The bot replies to messages that it writes
example

const discordBot = BotkitDiscord(config);

discordBot.hears('hello','direct_message',(bot, message) => {
    bot.reply(message, 'hello');
});

if you write "hello" to it it will just say hello over and over.
also the receive middlewares also get called for messages the bot sends