Add .caret style class to the caret node (Path).

Resolves #92.

Author: TomasMikula

richtextfx/src/main/java/org/fxmisc/richtext/skin/ParagraphText.java

@@ -96,6 +96,7 @@ public ParagraphText(Paragraph<S> par, BiConsumer<Text, S> applyStyle) {
         getChildren().add(selectionShape);
 
         // caret
+        caretShape.getStyleClass().add("caret");
         caretShape.setManaged(false);
         caretShape.setStrokeWidth(1);
         caretShape.layoutXProperty().bind(leftInset);