All tests now use account names, and dont use accounts[0] (except ERC… (#1137)

* All tests now use account names, and dont use accounts[0] (except ERC721)

* Added account names to some missing contracts.

test/library/MerkleProof.test.js

@@ -3,7 +3,7 @@ const { sha3, bufferToHex } = require('ethereumjs-util');
 
 const MerkleProofWrapper = artifacts.require('MerkleProofWrapper');
 
-contract('MerkleProof', function (accounts) {
+contract('MerkleProof', function () {
   let merkleProof;
 
   beforeEach(async function () {