As per jQuery docs the `innerWidth` method is the one that includes padding (https://api.jquery.com/innerWidth/), while the previously used `outerWidth` includes border width as well (https://api.jquery.com/outerWidth/). Therefore the use of `innerWidth` makes more sense for getting the container width with padding in the code (plus a setting name `includePadding` suggest only padding width is taken into account as an extra for container width determination and might be confusing otherwise). The same goes to `innerHeight` vs `outerHeight`.
Merge pull request #131 from Feasul/patch-1

Use innerWidth/Height instead of outerWidth/Height to determine the width/height of container.