Added data attribute to modify class of element when overlay is shown #100
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Often when the overlay is shown, users may want to customize the css of the element only for the duration during which the overlay is shown. For example, in the demo, a white border might be added to the image when the overlay is shown ( https://apophiz-gd.github.io/chardin.js/ ). This commit adds an attribute 'appendclass' which add's css classes when the overlay is shown.