skydb/sky — pull request #165 by benbjohnson (2014-01-23 16:47:26+00:00)
Title: Refactor factorizer.

This pull request is a rewrite of the `Factorizer` to improve performance. The biggest change is that a single writer transaction is used for everything now. This improved the performance by

```
BenchmarkFactorizer	2000	1450791 ns/op
BenchmarkFactorizer	50000	36662 ns/op
BenchmarkFactorizer	200000	9797 ns/op
```