Change the default SBF params to reduce initial size, and tighten default probability.
Change the default SBF params to reduce initial size, and tighten default probability.

mcanthony/bloomd,jedisct1/bloomd,jedisct1/bloomd,mcanthony/bloomd,armon/bloomd,jedisct1/bloomd,armon/bloomd,armon/bloomd,mcanthony/bloomd,jedisct1/bloomd