[CopyableText] extends compent class

[fguisso]

I'm using this component in the decrediton#2641 and I the style don't apply to child elements, my solution, seens not so good:

<CopyableText className={my_new_style}>testing</CopyableText>

.my_new_style span {
    ...
}

Maybe you can create somenthing like this:

<CopyableText spanStyle={my_new_span} buttonStyle={my_new_button_style} ...>testing</CopyableText>

[tiagoalvesdulce]

We'll be implementing this since people can choose between both approaches. I personally prefer the first one since you can stick to CSS. The second one you have to write JS objects. We can add both spanStyle and spanClassName so we have all the options available.