See #801 - recommends clean-css styles concatenation.

See #801 - recommends clean-css styles concatenation.

Why:

* There is a difference between passing in a concatenated string
  and letting clean-css do the job. The former will discard
  `@import` statements appearing not at the beginning of the string,
  while the latter will discard only those appearing not at
  the beginning of any of the files. Because of this behavior,
  the latter way is recommended.