Genki - v0.0.4

Updates

• Refactor genki.js when required to have fresh JSDOM environments on start
• Refactor generateStyles() -> addStyle() to push new barista styles to a styles array
• Add tests for addStyle()

Example:

var world = genki.start();

world.addStyle({
  content: `.hosei { background: blue }`
});

world.addStyle({
  content: `.hamada { background: red }`
});

Resolves: #3