BitPay, Blockchain.info, Circle, KnCMiner, Bitnet, Xapo, BitGo and itBit have agreed to implement Gavin Andresen’s BIP 101; F2Pool instead backs BIP100; the bitcoin exchange rate fell below US$200 and more top stories for August 25. 8 Leading Bitcoin Companies Pledge Support for BIP101 BitPay, Blockchain.info,…