remove redundant throwing of StopIteration from generators

content/commands.js

@@ -188,8 +188,6 @@ liberator.Commands = function () //{{{
             var sorted = exCommands.sort(function (cmd1, cmd2) { return cmd1.name > cmd2.name; });
             for (var i = 0; i < sorted.length; i++)
                 yield sorted[i];
-
-            throw StopIteration;
         },
 
         add: function (names, description, action, extra)

content/events.js

@@ -39,7 +39,6 @@ liberator.AutoCommands = function () //{{{
         for (var item in autoCommands)
             for (var i = 0; i < autoCommands[item].length; i++)
                 yield item + " " + autoCommands[item][i][0] + " " + autoCommands[item][i][1];
-        throw StopIteration;
     }
 
     /////////////////////////////////////////////////////////////////////////////}}}

content/mappings.js

@@ -160,7 +160,6 @@ liberator.Mappings = function () //{{{
             if (output)
                 yield maps[i];
         }
-        throw StopIteration;
     }
 
     function addMapCommands(ch, modes, modeDescription)

content/modes.js

@@ -189,8 +189,6 @@ liberator.modes = (function () //{{{
 
             for (var i = 0; i < modes.length; i++)
                 yield modes[i];
-
-            throw StopIteration;
         },
 
         get all() { return [this.NONE, this.NORMAL, this.INSERT, this.VISUAL,