Refactor helper scripts to use kredits module

This reuses the kredits library functions in the helper scripts and
seeds. We no longer need to add IPFS hashes manually but simply can
provider contributor/proposal data.

scripts/seeds.js

@@ -1,34 +1,39 @@
 const path = require('path');
 const seeds = require(path.join(__dirname, '..', '/config/seeds.js'));
-const IPFS = require('ipfs-api');
 
-var ipfs = IPFS({host: 'localhost', port: '5001', protocol: 'http'})
+const ethers = require('ethers');
+const Kredits = require('../lib/kredits');
+
+const each = require('async-each-series');
 
 module.exports = function(callback) {
   const Registry = artifacts.require('./Registry.sol');
 
-  const contracts = {};
-  Registry.deployed().then((registry) => {
-    Object.keys(seeds.contractCalls).forEach(async (contract) => {
-      var address = await registry.getProxyFor(contract);
-      console.log(`Using ${contract} at ${address}`);
-      contracts[contract] = await artifacts.require(contract).at(address);
+  Registry.deployed().then(async (registry) => {
 
-      Object.keys(seeds.contractCalls[contract]).forEach((method) => {
-        seeds.contractCalls[contract][method].forEach((args) => {
-          console.log(`[Sending] ${contract}.#${method}(${JSON.stringify(args)})`);
-          contracts[contract][method](...args).then((result) => {
-            console.log(`[Result] ${contract}.${method}(${JSON.stringify(args)}) => ${result.tx}`);
-          });
-        });
+    const networkId = parseInt(web3.version.network);
+    const provider = new ethers.providers.Web3Provider(
+      web3.currentProvider, { chainId: networkId }
+    );
+    const kredits = await Kredits.setup(provider, provider.getSigner());
+
+    each(seeds.contractCalls, (call, next) => {
+      let [contractName, method, args] = call;
+      let contractWrapper = kredits[contractName];
+      let func;
+      if (contractWrapper[method]) {
+        func = contractWrapper[method];
+      } else {
+        func = contractWrapper.functions[method];
+      }
+      func.apply(contractWrapper, args).then((result) => {
+        console.log(`[OK] kredits.${contractName}.${method}(${JSON.stringify(args)}) => ${result.hash}`);
+        next();
+      }).catch((error) => {
+        console.log(`[FAILD] kredits.${contractName}.${method}(${JSON.stringify(args)})`);
+        callback(error)
       });
-    });
+    }, () => { console.log("\nDone!") });
+
   });
-
-
-  seeds.ipfsContent.forEach((content) => {
-    ipfs.add(new ipfs.Buffer(JSON.stringify(content))).then((result) => { console.log(`[IPFS] added ${result[0].hash}`) });
-  });
-
-  callback();
 }