title: MongoError: auth failed mongoose connection string
body: <p>I can connect to the DB through terminal, but getting this error using mongoose and gulp. 
  mongoose/node_modules/mongodb/lib/mongodb/connection/base.js:246
  MongoError: auth failed</p>
  
  <p>My connection string is: </p>
  
  <pre><code>mongodb://usr:psw@localhost:27017/dbname
  </code></pre>
  
  <p>Any idea what it can be? </p>