Add view for finding inactive session lists for guests

This view lists loggedin documents for guests indexed by timestamp.

src/main/resources/views/logged_in

@@ -7,6 +7,9 @@
 		},
 		"visited_sessions_by_user": {
 			"map": "function(doc) { if(doc.type == 'logged_in') { emit(doc.user, doc.visitedSessions); }}"
+		},
+		"by_last_activity_for_guests": {
+			"map": "function(doc) {\n  if (doc.type == 'logged_in' && doc.user.indexOf('Guest') === 0) {\n    emit(doc.timestamp || 0, {_rev: doc._rev});\n  }\n}"
 		}
 	}
 }