add custom configuration to ~/.hyper.js

[IronLu233]

I use both hyperpower and power-mode for atom editor.

In atom editor, I can change the color of particles and enable/disable and screen shake.

I think it is necessary to add a custom configuration to ~/.hyper.js. So that user can custom hypers configuration.

it may be like

hyperPowerConfig = {
  wowMode: false,
  shake: true,
  randomColor: true,
  fixedColor: '#233333',
}

Can I fork it and pull a request for my idea?

[raz-canva]

Bump

[razfriman]

Decided to take this on since I wanted this feature @IronLu233 - Check out #66