Add support for postcss to be able to change variables

[ewnd9]

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Related to https://github.com/tachyons-css/tachyons/issues/258#issuecomment-248688530

This is an example of usage tachyons + webpack with overriding variables. I believe it could be added as a separate branch instead of merging to master because not everyone needs to override variables.

[mrmrs]

@ewnd9 Thanks a lot for putting this together! Will take a look now.

[ewnd9]

@mrmrs Happy to help :+1:

I've just updated commit with:

• move back the tachyons entry point
• move import/adjusting variables into a separate file in the css directory
• move back rm dist/tachyons.js, it was throwing an error because that file hadn't been generated in one of my attempts, now it is generating again

[ewnd9]

@mrmrs Any luck?

[ewnd9]

@mrmrs ping

[ewnd9]

@mrmrs ping

[montogeek]

ping, thanks @ewnd9