* Fix Edge doctype warning
* Remove getData() calls in onDragOver
Access to data within ondragover is prohibited
* Handle Edge errors accessing `dataTransfer.dropEffect`
* Work around Edge not supporting custom data in drag events
If unable to use `setData()` with custom type, then uses JSON obj to store data in 'text/plain'
* Fix more Edge errors
Edge sometimes throws 'NotSupportedError' whena accessing `items` property on `dataTransfer`
* Fix linting errors
* Fix formatting
* feat: Add ES6 polyfill to examples page
* Fixes issue with IE11 simply not displaying anything on load due to missing `Symbol` shim
* Move script to the bottom before build.prod.js file
