v4

- File weight halved;
- More fluid animations;
- The interval function has been removed, now the resize function
adjusts the div's position when the window is resized;
- From now on, the maximum width shall be declared in the CSS;
- gapL and gapR can now be overridden through the function without
modifying the plugin;
- You can now choose what type of TAG, when clicked, will close the
sidebar;
- Functions to be called are halved thanks to the implementation of the
attribute data-sbplugin.