Fixes #185 - snapshot incorrect receiving db instance instead of the ref

Author: Salakar

Diff for: lib/modules/database/index.js

@@ -171,7 +171,7 @@ export default class Database extends Base {
 
     if (this.subscriptions[handle] && this.subscriptions[handle][eventName]) {
       this.subscriptions[handle][eventName].forEach((cb) => {
-        cb(new Snapshot(this, snapshot), body);
+        cb(new Snapshot(new Reference(this, path.split('/'), modifiersString.split('|')), snapshot), body);
       });
     } else {
       FirestackDatabase.off(path, modifiersString, eventName, () => {