Feature/a in phas a distinct style

This should be declared on ```constructor.prototype```, not within the constructor. You're using an implicit closure here to access ```testClusters```. I would just put ```testClusters``` on this. If you really want to hide that in a closure, you could use a construct like this:

```javascript
(function () {
  return function TestCluster (options) {
    var b; 
    var constructor = function (options) {
      b = options;
    }; 
    constructor.prototype = {
      get: function () {
        return b;
      }
    }; 
    return new constructor(options);
  }
}());
``` 

But honestly, that seems a little complex for what we have here.