Fix various errors in CSS properties

ImageView.java:
    @Styleable(property="image", converter="com.sun.javafx.css.converters.URLConverter")
should be
    @Styleable(property="-fx-image", converter="com.sun.javafx.css.converters.URLConverter")

TilePane.java:
    @Styleable(property="-fx-alignment", initial="left")
should be
    @Styleable(property="-fx-alignment", initial="top-left")

VBox.java:
    @Styleable(property="-fx-alignment", initial="left")
should be
    @Styleable(property="-fx-alignment", initial="top-left")

Shape.java
    @Styleable(property="-fx-stroke", initial="black")
should be
    @Styleable(property="-fx-stroke")