added configuration option for collection search recursion (Islandora#78)

* added configuration option

* updated config

* pulled in changes from head

* synced with previous pr

* removed stub

* formatting

* Refactor SearchResultsPagerBlock for consistency

Author: ajstanley

config/schema/advanced_search.schema.yml

@@ -34,6 +34,9 @@ advanced_search.settings:
     facet_truncate:
       type: string
       label: Truncate Facet
+    recursive:
+      type: integer
+      label: Include Sub-Collections
     query_fields:
       type: sequence
       label: Query Fields