call signatures: decorator in class, test for #319
call signatures: decorator in class, test for #319

jonashaag/jedi,jonashaag/jedi,tjwei/jedi,WoLpH/jedi,tjwei/jedi,dwillmer/jedi,flurischt/jedi,flurischt/jedi,dwillmer/jedi,mfussenegger/jedi,WoLpH/jedi,mfussenegger/jedi