Merge pull request socketio#339 from 3rd-Eden/333

Don't require redis by default

lib/stores/redis.js

@@ -11,8 +11,7 @@
 
 var crypto = require('crypto')
   , Store = require('../store')
-  , assert = require('assert')
-  , redis = require('redis');
+  , assert = require('assert');
 
 /**
  * Exports the constructor.
@@ -25,6 +24,7 @@ Redis.Client = Client;
  * Redis store.
  * Options:
  *     - nodeId (fn) gets an id that uniquely identifies this node
+ *     - redis (fn) redis constructor, defaults to redis
  *     - redisPub (object) options to pass to the pub redis client
  *     - redisSub (object) options to pass to the sub redis client
  *     - redisClient (object) options to pass to the general redis client
@@ -60,6 +60,8 @@ function Redis (opts) {
     }
   }
 
+  var redis = opts.redis || require('redis');
+
   // initialize a pubsub client and a regular client
   this.pub = redis.createClient(opts.redisPub);
   this.sub = redis.createClient(opts.redisSub);