setAutoResize(true) in HistogramLogProcessor

Otherwise the HistogramLogProcessor may fail on otherwise reasonable
inputs with ArrayIndexOutOfBoundsException from

* `AbstractHistogram.java:567`
* `HistogramLogProcessor.java:207`

fixes #47
Merge pull request #48 from rkuhn/wip-47-HistogramLogProcessor-autoResize

setAutoResize(true) in HistogramLogProcessor
Good catch. Thx.