Add contracts to packages, fix most linting errors

packages/contracts/util/multi_sig_wrapper.ts

@@ -0,0 +1,34 @@
+import ABI = require('ethereumjs-abi');
+import ethUtil = require('ethereumjs-util');
+import * as _ from 'lodash';
+import * as Web3 from 'web3';
+
+import {ContractInstance, TransactionDataParams} from './types';
+
+export class MultiSigWrapper {
+  private multiSig: ContractInstance;
+  constructor(multiSigContractInstance: ContractInstance) {
+    this.multiSig = multiSigContractInstance;
+  }
+  public async submitTransactionAsync(destination: string, from: string,
+                                      dataParams: TransactionDataParams,
+                                      value: number = 0) {
+    const {name, abi, args = []} = dataParams;
+    const encoded = this.encodeFnArgs(name, abi, args);
+    return this.multiSig.submitTransaction(destination, value, encoded, {from});
+  }
+  public encodeFnArgs(name: string, abi: Web3.AbiDefinition[], args: any[]) {
+    const abiEntity = _.find(abi, {name}) as Web3.MethodAbi;
+    if (_.isUndefined(abiEntity)) {
+      throw new Error(`Did not find abi entry for name: ${name}`);
+    }
+    const types = _.map(abiEntity.inputs, input => input.type);
+    const funcSig = ethUtil.bufferToHex(ABI.methodID(name, types));
+    const argsData = _.map(args, arg => {
+      const target = _.isBoolean(arg) ? +arg : arg;
+      const targetBuff = ethUtil.toBuffer(target);
+      return ethUtil.setLengthLeft(targetBuff, 32).toString('hex');
+    });
+    return funcSig + argsData.join('');
+  }
+}