eth_getBlockByHash and block hash mapping functionality (#114)

* Set up block hash to height mapping storage and fixed linting issues

* fix typos

* Set up module query for block height

* fix bug with block mappings and implemented get block by hash

* Fix other consensus hash references

crypto/keys/codec.go

@@ -4,9 +4,9 @@ import (
 	cryptoAmino "github.com/tendermint/tendermint/crypto/encoding/amino"
 
 	"github.com/cosmos/cosmos-sdk/codec"
+	cosmosKeys "github.com/cosmos/cosmos-sdk/crypto/keys"
 	"github.com/cosmos/cosmos-sdk/crypto/keys/hd"
 	emintCrypto "github.com/cosmos/ethermint/crypto"
-	cosmosKeys "github.com/cosmos/cosmos-sdk/crypto/keys"
 )
 
 var cdc *codec.Codec

crypto/keys/keybase.go

@@ -13,8 +13,8 @@ import (
 	cosmosKeys "github.com/cosmos/cosmos-sdk/crypto/keys"
 	"github.com/cosmos/cosmos-sdk/crypto/keys/hd"
 	"github.com/cosmos/cosmos-sdk/crypto/keys/keyerror"
-	"github.com/cosmos/ethermint/crypto/keys/mintkey"
 	"github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/ethermint/crypto/keys/mintkey"
 
 	bip39 "github.com/cosmos/go-bip39"