Merge remote branch 'cloudant:77867-add-indexer-pid-to-task-status'

This closes #62

Signed-off-by: ILYA Khlopotov <iilyak@apache.org>
diff --git a/src/couch_mrview_updater.erl b/src/couch_mrview_updater.erl
index 8a85887..645f02b 100644
--- a/src/couch_mrview_updater.erl
+++ b/src/couch_mrview_updater.erl
@@ -38,6 +38,7 @@
     Self = self(),
     MapFun = fun() ->
         couch_task_status:add_task([
+            {indexer_pid, Partial},
             {type, indexer},
             {database, State#mrst.db_name},
             {design_document, State#mrst.idx_name},