reactjs / react-modal / 499

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[added] Support using multiple document.body classes

* update `bodyOpenClassName` prop to handle adding and removing multiple
  class names

* update String#includes polyfill to work properly

* ensure shared classes on `document.body` persist on one modal close if
  multiple modals are open

* create new helper for adding/removing class names from body element

* remove unmaintained and obsolete `element-class` library

* rename refCount private variable `modals` to `classListMap`

* create `get` method on refCount helper for public access to the class
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