use vimrc defined g:pdv_cfg_ClassTags

In you .vimrc, you can also specify the tags and the order they appear for
class docblocks:
let g:pdv_cfg_ClassTags = ["package","author","version"]

Signed-off-by: BlackEagle <ike.devolder@gmail.com>
Merge pull request #1 from BlackIkeEagle/classtags-behave-like-documentation

use vimrc defined g:pdv_cfg_ClassTags