Remove IPFS pinner

The pinner now lives in its own npm package

lib/contracts/record.js

@@ -9,18 +9,6 @@ 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;