Update the bult-in CSS complete function to latest CSS standard.
The latest stable file already in vim repo, this repo will keep update for beta test.
Use pathogen or vundle is recommended. Vundle:
Plugin 'othree/csscomplete.vim'
Set omnifunc to csscomplete#CompleteCSS
autocmd FileType css setlocal omnifunc=csscomplete#CompleteCSS noci
Same as VIM