Support for Less files

[nicolabortignon]

Added support for less file.
Sass is still used uniquely throughout the examples, but now is possible to require() .less files as well.

[nicolabortignon]

Fixes #202 and #158.

[erikras]

Very nice. 👍

[catamphetamine]

Well well well...

So, everywhere in webpack configs you have

           { test: /\.less$/, loader: 'style!css!less' },
           { test: /\.scss$/, loader: 'style!css?modules&importLoaders=2&sourceMap&localIdentName=[local]___[hash:base64:5]!autoprefixer?browsers=last 2 version!sass?outputStyle=expanded&sourceMap' }

No wonder it throws an Exception while JSON parsing less modules - because you don't use "modules" parameter for "css" loader.
Make up your mind: either you are using "css modules" feature for less or you don't.
This is a complex topic for a newbie.
You could've just copy pasted everything from scss.
You chose your own config instead and that's the reason it doesn't work.

[catamphetamine]

@nicolabortignon parser function takes the final loadered css and transforms it to anything you'd like it to be when require()d

[nicolabortignon]

Ok, I'd say I prefer to stick with the same modules used in the scss loader. If you agree with me, I'll PR the fix.

[catamphetamine]

@nicolabortignon I personally don't use the "modules" feature of css-loader but the difference between less and scss in your case creates a source of confusion and false bug reports, so I'd advice you to fix the differences and make the config uniform both for scss and less.