Fix BlockchainReactor bug w/ mismatched state.LastBlockHeight vs store.Height
Fix BlockchainReactor bug w/ mismatched state.LastBlockHeight vs store.Height

This is due to a non-atomic saves of state.State vs blockchain.Store.
This is a simple hack.

tendermint/tendermint,tendermint/tendermint,tendermint/tendermint,tendermint/tendermint