Redirect worker console to window console

Use __defineGetter__ instead of setting a
console property on self because cefode
already defines a console via __defineGetter__
and we need to override it.

src/stdlib/task-shell.coffee

@@ -7,10 +7,11 @@
 
 self.window = {}
 self.attachEvent = ->
-self.console =
+console =
   warn: -> callTaskMethod 'warn', arguments...
   log: -> callTaskMethod 'log', arguments...
   error: -> callTaskMethod 'error', arguments...
+self.__defineGetter__ 'console', -> console
 
 self.nodeRequire = self.require
 self.require = undefined