Transformation mixins breaking valid CSS code.

The Transformation mixins such as scale, translate, etc... were all breaking their normal CSS counterparts. 

Because of transparent mixins and what not in Stylus, with a rule such as:
`transform: scale(1)`

You'd end up getting something along the lines of:
`transform: transform: scale(1);;`

I simply commented out the transformation mixins like the other various mixins were also commented out.
I checked and the only rule to use any of the mixins commented out was for modals and it used the translate mixin.
I changed it to not use a mixin (just normal CSS transform: `translate()`) as nib should take care of this, or autoprefixer if anyone is using that.

Would be great to get it merged in, unless there was a specific reason to keep this.