KeySplitter don't work for short parameter

Using parameter like 'q' failed into the keysplitter. It falsy consider it as an array.

Here is a proposal for fix :

``` javascript
Backbone.Syphon.KeySplitter = function(key){
  var matches = key.match(/[^\[\]]+/g);

  //Hack for short parameter
  if (key.length>2 && key.indexOf("[]") === key.length - 2){
    lastKey = matches.pop();
    matches.push([lastKey]);
  }

  return matches;
}
```
