title: Adding [[String:AnyObject]] as parameter on Alamofire call (Swift 2)
body: <p>I have this JSON (this is a simplified version):</p>
  
  <pre><code>{
     "from":0,
     "location": [{
         "city":"Barcelona"
         }]
  }
  </code></pre>
  
  <p>And i'm trying to do an Alamofire request with this JSON on parameters. So I have typed something like this:</p>
  
  <pre><code>let parameter = [
    "from":0,
    "location": [
     ["city": "Barcelona"] 
    ]
  ]
  </code></pre>
  
  <p>But it seems Alamofire doesn't accept the parse from [{ }]  to [[]] on parameters. I have read that one way to solve this is using a MutableURLRequest but i don't find any clear example.</p>
  
  <pre><code>Alamofire.request(.GET, "http://myurl", parameters: (params as! [String : AnyObject]), headers: nil).responseCollection { (response: Response&lt;[Group], NSError&gt;) in
  switch response.result {
              case .Success(let groups):
                  print("Success")
              case .Failure(_):
                  print("Failure")
              }
          }
  </code></pre>
  
  <p>This code above works and I get a result from this Alamofire Request but ignores this:</p>
  
  <pre><code>"location": [ ["city": "Barcelona"]]
  </code></pre>
  
  <p>Could someone can help with that? Thank you so much.</p>