"Prev" and "Next" link breaks when using custom html string in "prev_text" and "next_text"

[allenfantasy]

Hi Birke! First of all thank you for your great pagination plugin!

I found an issue which could be a problem if one (like me) wants to customize the pagination appearance.

I passed these options when calling pagination, because I want use "<" and ">" to indicate "prev" and "next":

$("#pagination").pagination(total, {
    prev_text: '<i class="fa fa-angle-left icon-angle-left"></i>',
    next_text: '<i class="fa fa-angle-right icon-angle-right"></i>',
    callback:handlePaginationClick
});

However when I do so, the "prev" and "next" link are broken. After I checked the source code I think I got the reason here:

function paginationClickHandler(evt){
    var links,
        new_current_page = $(evt.target).data('page_id'), // In this line breaks!
        continuePropagation = selectPage(new_current_page);
    if (!continuePropagation) {
        evt.stopPropagation();
    }
    return continuePropagation;
}

Since evt.target would get the DOM element directly listening the event so it points to the <i> element which I inserted before, thus causing the page_id unavailable anymore.

My suggestion is to change evt.target to evt.currentTarget, which is always the DOM element which the event attached to.

I would like to have a PR if needed.

Thank you!