v0.3.0

Refactor to fix native selection and focus issues.


See atom/atom#16267

The Atom text editing components (text-editor, selection, marker) call their event handlers synchronously. Within a handler of a cursor event the text buffer, the cursor, and the selection cannot be reliably updated (the editor loses focus somewhere during the updates). So the updates were refactored to happen asynchronously. As a result the cursor jump has become clearly visible, but this does not break the UX of this package.