Support syntax groups in imports for: module names, operators, functions, and etc.

[geraldus]

Hi! I'm using following trick to determine what syntax group is under cursor.
I've noticed that there is no syntax groups attached to module names, functions etc. imports, thus there is no way to highlight them.
Compare GitHub's highliting with screenshot:

import qualified Data.Text as T
import Aeson (Value(..), encode)
import Control.Applicative ((<$>))