bloom: do not set bits for removed entries

This should improve bloom filter perfomance in cases when there is some
number of removed keys in blob.
This also helps workloads with many rewrite cycles.
blob: re-formatted log message
blob: re-formatted eblob_write_prepare_disk()
Merge pull request #21 from SaveTheRbtz/master

Bloom performance and formatting fixes.
Debug. Cleanup.
Merge branch 'master' of github.com:reverbrain/eblob
v0.19.8