Introduce Scaninfo#free to reduce workload of ScaninfoVector#free
grn_scan_info_alloc() don't free vector of scan_info
Convert put_logical_op to ruby script
Fix typo
Remove scan_info_init to reduce diff from original repo
Rename grn_grn_to_mrb() => grn_mrb_from_grn()
Change the order of arguments of grn_mrb_obj_new()