Add displayName to ScrollbarComponent and ScrollbarCornerComponent

src/scrollbar-component.coffee

@@ -4,6 +4,8 @@ React = require 'react-atom-fork'
 
 module.exports =
 ScrollbarComponent = React.createClass
+  displayName: 'ScrollbarComponent'
+
   render: ->
     {orientation, className, scrollHeight, scrollWidth, visible} = @props
     {scrollableInOppositeDirection, horizontalScrollbarHeight, verticalScrollbarWidth} = @props

src/scrollbar-corner-component.coffee

@@ -2,7 +2,9 @@ React = require 'react-atom-fork'
 {div} = require 'reactionary-atom-fork'
 
 module.exports =
-ScrollbarComponent = React.createClass
+ScrollbarCornerComponent = React.createClass
+  displayName: 'ScrollbarCornerComponent'
+
   render: ->
     {visible, measuringScrollbars, width, height} = @props