Views declarations need proper fixing to avoid warnings

Strict warning: Declaration of views_handler_field_item_node_nid::init() should be compatible with that of views_handler_field::init() in require_once() (line 11 of merci/handlers/views_handler_field_item_node_nid.inc).
    Strict warning: Declaration of views_handler_field_item_node_nid::pre_render() should be compatible with that of views_handler_field::pre_render() in require_once() (line 11 of merci/handlers/views_handler_field_item_node_nid.inc).

(edited the paths to be relative)