blob: improve log mesage on lock fail
bloom: added loop count to stats
bloom: improve bloom filter hit rate

Use guidelines from
    "Less Hashing, Same Performance: Building a Better Bloom Filter"
        by Adam Kirsch and Michael Mitzenmacher, 2006

Now we are using many (up to 20) hash functions instead of just two,
burning (probably idle) CPU in hope to save IOPs.
Merge pull request #30 from SaveTheRbtz/master

Improve bloom hit rate and usability fixes.