contrib: initialization bugfix after lua52 port

The _NAME field was missing in the contrib table. Thanks to Jorg
Thalheim for reporting this.

contrib/init.lua

@@ -11,7 +11,7 @@ local wrequire = require("vicious.helpers").wrequire
 
 -- Vicious: widgets for the awesome window manager
 -- vicious.contrib
-local contrib = {}
+local contrib = { _NAME = "vicious.contrib" }
 -- }}}
 
 -- Load modules at runtime as needed

init.lua

@@ -22,6 +22,7 @@ local helpers = require("vicious.helpers")
 -- Vicious: widgets for the awesome window manager
 local vicious = {}
 vicious.widgets = require("vicious.widgets")
+--vicious.contrib = require("vicious.contrib")
 
 -- Initialize tables
 local timers       = {}