Add support for CSS / SCSS modules.

[mayank1513]

1. sass should be added only as a dev dependency.

2. The final build should produce CSS files following BEM conventions.

   2.1. No hash should be added - to allow library users to use classNames with confidence.
   2.2. In many cases strict BEM convention may not be possible as it will depend on library builders.
   2.3. Treat component folder names as blocks

3. Multiple CSS files should be created corresponding to each component, as well as the overall CSS file containing styles for all components.

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