Flexible change on classNames

[jvmartins]

It should be possible to change a className in some components of the InputRange without resetting all the default classes.

For example, given the InputRange classNames set below:

...
classNames={ { component: 'custom-input-range__component' } }
...

That will remove all the default classes and setup the component only. It should be possible to keep the default behaviour for other classes of components (like labelMax, labelMin, slider) and change only other desired ones.

Another possibility would be export all default class names and extend them.

[skychavda]

Still, this issue is there