Make Arrows customizable II:
- If an HTML string is passed, then append the new node jQuery creates to the slider, but if a CSS selector, DOM node or jQuery object is passed, don't append those nodes to the slider because they should already be present in the DOM. This gives designers greater flexibility.
- If the event (click) target in a dot or arrow is a link, prevent the default behavior! I've added this since dots' HTML can be customized, and arrows' HTML too with this pull request.