Add style property to package.json, allowing for easier imports.

[davejtoews]

When installed via npm, a style property in package.json allows this module to be easily imported when using tools such as npm-sass or sass-module-importer.

Apparently the "style" key is not a standard, but it is a growing trend. Here's a StackOverflow thread on the subject: http://stackoverflow.com/questions/32037150/style-field-in-package-json

[whmii]

@davejtoews the StackOverflow link you cited was from 2015 and mentions…

We're hoping to get this standardized at some point…

Is this actually used by any tooling?

[davejtoews]

@whmii In addition to npm-sass and sass-module-importer mentioned above, it's also used by npm-css, rework-npm, npm-less, parcelify, and diamond, and It's been flagged as a "nice-to-have" feature in webpack's css-loader.

I made a similar PR on Bourbon, and you can see the discussion there.