Merge pull request #39 from 67P/fix/ipfs-hash

Replaces the ipfsHash buffer with a B58 string

lib/utils/ipfs.js

@@ -17,9 +17,9 @@ class IPFS {
       return data;
     }
     // merge ipfsHash (encoded from hashDigest, hashSize, hashFunction)
-    data.ipfsHash = this.encodeHash(data);
+    data.ipfsHash = multihashes.toB58String(this.encodeHash(data));
 
-    return this.cat(data)
+    return this.cat(data.ipfsHash)
       .then(deserialize)
       .then((attributes) => {
         return Object.assign({}, data, attributes);