About redis cluster delete key operation issue suggestion

[ericli1018]

Hi all,
When I use redis cluster, I found an issue at node_modules/node-resque/lib/worker.js line 386.
I suggested use async to rewrite that delete key operation.
Because on cluster mode, ioredis library can not delete key on different slot at once.
That error message sow below:
"CROSSSLOT Keys in request don't hash to the same slot".

I rewrite some code to fix this issue.

async.each(
    [
        self.connection.key('worker', name, self.stringQueues()),
        self.connection.key('worker', name, self.stringQueues(), 'started'),
        self.connection.key('stat', 'failed', name),
        self.connection.key('stat', 'processed', name)
    ], 
    function iteratee(item, callback){
          self.connection.redis.del( item, function(err){
                callback(err);
            });
    }, 
    function(error){
        if(error){ self.emit('error', null, null, error); }
        if(typeof callback === 'function'){ callback(error); } 
    }
);

[evantahler]

Great research!
This will be fixed by: #159

[evantahler]

> npm publish
+ node-resque@3.0.4