Debugger detach/notifications for uncaught errors/notification levels

[staeke]

I'm creating this issue to make a pull request. I have the following issues that I've fixed in my fork:

• ts-node-dev doesn't detach correctly from Chrome's debugger
• No notification for uncaught process errors
• No level on notifications (I prefer errors only)
• Watch files that don't exist but the current code is dependent on for good restarting mechanisms. Consider case where A requires B, but B doesn't exist. Then, whenever B is created, we want a restart. Currently doesn't work