Added eth_logs & fixed issue with manual log filtering

* Implemented `eth_logs`
* Fixed issue with `filter.Find()` where logs were appended to an
  incorrect, non-returned slice resulting in no logs found

cmd/utils/cmd.go

@@ -272,7 +272,7 @@ func BlockDo(ethereum *eth.Ethereum, hash []byte) error {
 	parent := ethereum.ChainManager().GetBlock(block.ParentHash())
 
 	statedb := state.New(parent.Root(), ethereum.Db())
-	_, err := ethereum.BlockProcessor().TransitionState(statedb, parent, block)
+	_, err := ethereum.BlockProcessor().TransitionState(statedb, parent, block, true)
 	if err != nil {
 		return err
 	}