Export the Token component

In some cases, users might want to use the built-in Token component and maybe override it with a wrapper or something else.

example:
```
onBuildTokenValue={(props, meta) => {
      if (meta.error) {
        return <span>{props.tokenValue}</span>;
      }
      return <Token>{props.tokenValue}</Token>
    }}
```

This will allow the users to extend existing Token component.