use css-to-object for parsing styles

[danielberndt]

css-to-object uses a more elaborate parsing algorithm. For example it deals correctly with semicolons within a url() property.

fixes #158

[DanBuild]

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[Daniel15]

Looks like the build failed... Could you please take a look?

[danielberndt]

Okay I fixed the built. I needed to add an empty fs shim. i also had to apply babel to the bundle, since some of the dependencies used es6 which could not be uglified with the ugligy version used in this project.

I should probably also mention, that the size of the bundle has now significantly increased. Because a full css parser is now included. The .min.js files are now ~75KB instead of ~18KB.

[Daniel15]

Could you please also try shim source-map-support and see if that reduces the bundle size? We don't really need source maps for this use case (ref https://github.com/reworkcss/css/blob/master/lib/stringify/index.js#L30-L32).

Please check where the bundle size increase is coming from and whether everything being added is 100% needed.