twitter/algebird — pull request #252 by cheecheeo (2014-01-22 23:38:04+00:00)
Title: Abstract 'create' methods into their own trait

@johnynek proposed that algebird could have the following trait [1]:

```scala
trait Preparer[I, O] {
def create(in: Seq[I]): O
}
```

This would formalize the usage of ```create``` in BloomFilter, CountMinSketch, HyperLogLog, SketchMap and the proposed SketchMap1 (#251)

This class likely belongs in Aggregator.scala

[1] https://github.com/twitter/algebird/pull/251#discussion_r9051358