Allow users to set their own classes for elements
Allow users to set their own classes for elements

This change allows users of the `react-tagsinput` component to set the
CSS classes of the sub-elements of the component themselves.

It's very useful when you already have a stylesheet in place or if you
need to adhere to a naming scheme for your classes (like SuitCSS).

olahol/react-tagsinput,olahol/react-tagsinput