Add a config to change which CSS-Pre-Processor

[GeorgeWL]

I've seen plenty of folks use alternatives to SASS.

Such as:

• LESS http://lesscss.org/
• Stylus http://stylus-lang.com/
• PostCSS http://postcss.org/

So it might be nice to have a prompt such as Choose your CSS Preprocessor

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[lifenautjoe]

Hey George! Sounds like a good idea!

I'll try to get this done on the weekend!

Cheers!