REST _changes handler: Default feed type to 'normal' when unset (#3992)
REST _changes handler: Default feed type to 'normal' when unset (#3992)

Fixes replication stat being counted as a continuous replication
when feed type not explicitly set in a request.
couchbaselabs/sync_gateway,ceejatec/sync_gateway,ceejatec/sync_gateway,ceejatec/sync_gateway,ceejatec/sync_gateway,couchbaselabs/sync_gateway,couchbaselabs/sync_gateway,couchbaselabs/sync_gateway