[MySQL][Spider]Spider-2.12 released

I'm pleased to announce the release of Spider storage engine version 2.12(beta).
Spider is a Storage Engine for database sharding.
http://spiderformysql.com/

The main changes in this version are following.
MariaDB support.
- Add server parameter "spider_connect_mutex", "spider_connect_retry_count" and "spider_connect_retry_interval".
This parameters are used for avoiding failed connected processing caused by intense connected processing. (Especially for using "spider_conn_recycle_mode=0")

Please see "99_change_logs.txt" in the download documents for checking other changes.
Thanks to Mohammad and Jay for bug report.

Enjoy!