Refactor IPFS pinner

lib/contracts/record.js

@@ -9,6 +9,18 @@ class Record extends Base {
         return Promise.all(records);
       });
   }
+
+  pinIpfsHashes () {
+    return this.count.then(count => {
+      let promises = [...Array(count).keys()].map(i => {
+        let id = i + 1; // 0 => 1 - ids start with 1 and not with 0
+        return this.getData(id).then(data => {
+          return this.ipfs.pin(data);
+        });
+      });
+      return Promise.all(promises);
+    });
+  }
 }
 
 module.exports = Record;