Detailed statistics

Allows using `TestPerformance` to gather statistics like the following (taken with Java LR parsing the files in src.zip from JDK 7).

![img_18052013_141115](https://f.cloud.github.com/assets/1408396/522179/3ed3598e-c002-11e2-8a68-9f0e7e4f588b.png)