Drop camelCase to kebab-case auto-conversion

[zamith]

Why:

• There are css architectures that use uppercase class names in their
  naming convention, for example, SUITCSS (https://suitcss.github.io/).
  Therefore we don't want to restrict that.

This change addresses the need by:

• Allowing binary or atom css classes to go through untouched, even in
  lists. When they're defined as a property we lose control over exactly
  how it's going to be named and that can also be improved, but not as
  big of a deal.

As a side note, I noticed that the project does not use mix format.
Any particular reason?

[msaraiva]

Hi @zamith!

Thanks for the PR.

The camel case to kebab case auto-conversion will be removed very soon (before the next alpha version) so I believe the changes in this PR will no longer be necessary (please, let me know if it still does). The whole discussion can be found here.

I noticed that the project does not use mix format. Any particular reason?

Yeah, I have mixed feelings about the formatter. I think some of the decisions it makes are really bad, especially regarding indentation. However, I understand the importance of a unified format for all developers so I will eventually start using now as we starting to get more contributions. So I'll make sure I'll run it before releasing the next alpha version.

Cheers.

[msaraiva]

@zamith with the suggested changes your PR is exactly what needs to be done to drop the camel-to-kebab and close #52! Please let me know if you disagree in any way.

[zamith]

@msaraiva Done. Also removed to_kebab_case/1 as it's not used anymore