Default to kosmos IPFS

we always had issues with IPFS not finding data from other peers

lib/utils/ipfs.js

@@ -5,7 +5,7 @@ const fetch = require('node-fetch');
 class IPFS {
   constructor (config) {
     if (!config) {
-      config = { host: 'localhost', port: '5001', protocol: 'http' };
+      config = { host: 'ipfs.kosmos.org', port: '5444', protocol: 'https' };
     }
     this._config = config;
     this._ipfsAPI = ipfsClient.create(config);

test/contracts/Contributor.js

@@ -95,7 +95,7 @@ describe("Contributor contract", async function () {
       expect(c['balance']).to.equal(0);
       await Contributor.connect(addr1).withdraw();
       c = await Contributor.getContributorById(2);
-      expect(c['balance'].toString()).to.equal("6500000000000000000000");
+      expect(c['balance']).to.equal(6500);
       expect(c['kreditsWithdrawn']).to.equal(6500);
     });