clean up throttle code after hack.  adjust parameters based upon handoff and voxer130k performance.
clean up throttle code after hack.  adjust parameters based upon handoff and voxer130k performance.

tempbottle/leveldb-1,icholy/leveldb,icholy/leveldb,basho/leveldb,basho/leveldb,icholy/leveldb,tempbottle/leveldb-1,tempbottle/leveldb-1,basho/leveldb