Tweaking the clusterererer

– We had problems using the NiceResponse instead when clustering > 1000k results
– Now we are using the raw elasticsearch response hash
– Also we do not extend the hash but create a new class which also is 4 times faster (see below)

[2014-05-28 12:23:25] INFO Creating chewy hits (4.2ms)
[2014-05-28 12:23:25] INFO Extending chewy hits (25.2ms)