0.7.0

Changed

• Use private field_description, field_errors, and label components in
  field component. Apply base class to field_description and field_errors
  components.
• Use plain div with {base_class}-frame class instead of nested frame
  component in image component. This div does not receive the ratio
  attribute anymore. Apply the ratio with a CSS selector on the root div
  instead (e.g. .image.is-4-by-3 > .image-frame).

Removed

• field_description component.
• field_errors component.
• label component.