sunspot/sunspot — pull request #218 by fabn (2012-04-23 21:19:18+00:00)
Title: Propagate :first_id option to find_in_batches, before was always nil

I'm working on a customized version of the `reindex_task` which uses the `solr_index` method and I've found out that the documented :first_id option is not correctly propagated to the `find_in_batches` AR method.

This commit should fix it.