Revert "Dont' override glamor methods, use a new object instead (#754)" (#755)

This reverts commit 8651662.

Author: timneutkens

lib/css.js

@@ -1,7 +1,5 @@
 import { deprecated } from './utils'
-import glamor from 'glamor'
-
-const css = Object.assign({}, glamor)
+const css = require('glamor')
 
 for (const [k, v] of Object.entries(css)) {
   if (typeof v === 'function') {