Add support of filters
Fix previous patch and change logic.

The filters are used in the getStatistic() method and no more only in
the drawStatistic() method.
The getStatistic() method receive a new argument: $considerFilters,
whether we should consider the filters.
Add explanations about Hoa\Bench::filter().
[auto] Merge from Bench

    • #c57185d — Add support of filters (camael24, 2013-05-17)
    • #f8da2df — Fix previous patch and change logic. (Ivan Enderlin, 2013-05-22)
    • #2d39f07 — Add explanations about Hoa\Bench::filter(). (Ivan Enderlin, 2013-05-22)

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Merge remote branch 'library-bench/master'