Support mutating objects

[schneiderfelipe]

Use a composable API (like D3.js, jQuery, etc.).

EDIT: roadmap

• [ ] #13
  • [x] appending children
  • [x] adding general attributes
  • [x] inserting event listeners
  • [ ] stuff related to CSS selectors
  • [ ] adding classes
  • [ ] adding IDs
  • [ ] modifying tags?
• [ ] things related to destroying nodes
  • [ ] removing children
  • [ ] removing attributes
  • [ ] removing event listeners?
• [x] unroll loops for not-so-large changes (up to eight items)
  • [x] for children
  • [x] for attributes
  • [x] for events
• [x] tests for everything above

[schneiderfelipe]

This is strongly related to #10.

[schneiderfelipe]

~Support for appending children is there (and with ad046c9bb914706015219fc4526262f357bd63bc we now unroll loops of up to five elements 🎈).~

See what is implemented above.