add more contributors

AUTHORS

@@ -3,18 +3,20 @@ Openbox authors/contributors:
 Mikael Magnusson (mikachu@comhem.se)
  - Developer
 Dana Jansens (danakj@orodu.net)
- - Lead Developer
+ - Lead developer
 Derek Foreman (manmower@openbox.org)
  - Rendering code
 Tore Anderson (tore@linpro.no)
- - Directional focus, Edge moving/growing actions
+ - Directional focus, edge moving/growing actions
 Audun Hove (audun@nlc.no)
  - Actions code, move window to edge actions
 Marius Nita (marius@cs.pdx.edu)
  - Otk prototype code, design ideas.
-Mike Bacso (smakwel@yahoo.com)
- - Themes
 John McKnight (jmcknight@gmail.com)
- - Clearlooks Themes
+ - Clearlooks themes
 David Barr (david@chalkskeletons.com)
- - Bear2 Theme
+ - Bear2 theme
+Brandon Cash
+ - SplitVertical gradient style
+Dan Rise
+ - Natura theme