Added core files to gitignore
Fixed headers classes
Start of click tracking code.
Added landing page from a slide click that will redirect to the URL.
Admin pages can change 'smart' status for each slider.
Slides now link to the new landing page.
Component now sorts by click count if that option is enabled in the admin pages.
Slide lists now reorders according to number of clicks if chosen.
Refactor to simplify SliderTracker class.
Added slider admin page titles.
Added note about the slide ordering on the slide list.