staking: remove unused bytes library

Author: abarmat

.soliumignore

@@ -1,7 +1,7 @@
 node_modules
-contracts/Staking.sol
-contracts/Migrations.sol
+contracts/abdk-libraries-solidity
 contracts/bancor
 contracts/openzeppelin
+contracts/Migrations.sol
 contracts/MultiSigWallet.sol
-contracts/abdk-libraries-solidity
+contracts/Staking.sol

contracts/Staking.sol

@@ -11,11 +11,9 @@ import "./Governed.sol";
 import "./GraphToken.sol";
 import "./libs/Rebates.sol";
 import "./libs/Stakes.sol";
-import "./bytes/BytesLib.sol";
 
 
 contract Staking is Governed {
-    using BytesLib for bytes;
     using SafeMath for uint256;
     using Stakes for Stakes.Indexer;
     using Stakes for Stakes.Allocation;