convert focusedInstance to set
convert focusedInstance to set

taking a stab at #4, this lets us store all mounted instances instead of just the
most recent one, sorted according to most recent activation (mount or click). the
keydown listener thereby tests the event against these focusedInstances in reverse
chronological order, and the first matching binding gets triggered.

salmanm/react-keydown,jedverity/react-keydown,glortho/react-keydown,jedverity/react-keydown,salmanm/react-keydown,glortho/react-keydown