Dash vs. Underscore

[davewhitley]

Any reason why we are using a hyphen here instead of an underscore like it's used in the Field Guide?

(in colors.scss)

[MichaelArestad]

Yep. I think we need to get on the same page with our prefixes across both class names and variables. We had a brief discussion about this in Skype.

I would prefer reserving underscore for name-spacing and use hyphens for spaces.

Example:

.wpcom_awesome-logo {
    color: $light-blue;
}

I know the current color file is already in place and if it's super painful to change, it's no big deal going back. I do, however, think we should get on the same page with name-spacing.

[MichaelArestad]

Went full-on BEM this update.

Details in README.md