Add ReactEditorView::getModel shim
Revert "Upgrade space-pen now that problem with 3.2.4 is fixed"

This reverts commit 7dcafb44f15e21d3928d6d1eec172e6970b5f5bb.
fold classes work
Beginning of decorations
Renders decoration changes.
Rendering decorations works well.

Also specs.
Debounce the rendering of decorations
Add initial addDecorationForMarker()
Specs for marker decorations
Implement removeDecorationsForMarker
Nof
Name changes
Clean up specs based on feedback.
Add api for getStartBufferPosition and related fns
:lipstick: Clean up based on feedback
:lipstick:
Add `addDecorationForBufferRowRange` and related remove
Remove the comment about overlap

Turns out it’s already dealing with overlap by not emitting events
when there is an overlap.
:lipstick: remove decoratorType instance var
Use setImmediate rather than setTimeout