change how redistogo install works

package.json

@@ -17,6 +17,7 @@
     "winston": "0.6.2",
     "connect": "1.9.2",
     "redis-url": "0.1.0",
+    "redis": "0.8.1",
     "uglify-js": "1.3.3"
   },
   "devDependencies": {

server.js

@@ -36,7 +36,8 @@ if (!config.storage.type) {
 }
 
 var Store, preferredStore;
-if (config.storage.type === 'redistogo') {
+
+if (process.env.REDISTOGO_URL) {
   var redisClient = require('redis-url').connect(process.env.REDISTOGO_URL);
   Store = require('./lib/document_stores/redis');
   preferredStore = new Store(config.storage, redisClient);