v0.6.0

Major Changes

• #94 90cde79 Thanks @dimfeld!

Allow setting layers to be non-interactive. Layers with interactive={false} will not emit mouse events, and will not
participate in hit testing when comparing to other layers with eventsIfTopMost.

This is useful, for example, when placing a SymbolLayer on top of a
CircleLayer. See the updated "Clusters and Popups" example; previous the popup would disappear when the mouse was over
the labels, but not it does not.

This is a breaking change:

• The interactive prop for Marker and MarkerLayer has been renamed to asButton, to make room for the new
  interactive prop.
• DeckGlLayer still continues to allow the pickable prop, but interactive should be used instead for consistency.
  The behavior here is unchanged though.

Minor Changes

• #91 52a7f4b Thanks @dimfeld! - Export source helpers for use by other Source components

Patch Changes

• #93 4357161 Thanks @dimfeld! - Fix exception when clicking a deck.gl layer with a Popup