React-slick: support for modular css

[vgrafe]

I've been struggling to add this component to a reactjs project basing styling on modular css, so I started hacking around. This is definitely not PR worthy at this point, so I here is an issue.
The concept is very simple: get rid of classnames and import the css instead.

The branch is here, feel free to participate/criticize.

Shortcomings:

• I removed all fonts referenced in css
• I merged the theme into the base css file
• the dots won't work

I'd love to provide a decent PR, but won't spend much more time if no one shows interest.

[akiran]

We may not support this at the moment.