support REDIS_URI env var

lib/crowi/index.js

@@ -147,7 +147,7 @@ Crowi.prototype.setupSessionConfig = function() {
     , session  = require('express-session')
     , sessionConfig
     , sessionAge = (1000*3600*24*30)
-    , redisUrl = this.env.REDISTOGO_URL || this.env.REDIS_URL || null
+    , redisUrl = this.env.REDISTOGO_URL || this.env.REDIS_URI || this.env.REDIS_URL || null
     , mongoUrl = getMongoUrl(this.env)
     ;