Add MariaDB KB page for System Variable Differences Between MariaDB 10.1 and MySQL 5.6

MariaDB KB has a page on "System Variable Differences Between MariaDB 10.0 and MySQL 5.6" at the following URL:

https://mariadb.com/kb/en/mariadb/system-variable-differences-between-mariadb-100-and-mysql-56/

As we MariaDB 10.1 GA and MySQL 5.7 is also GA, it would be better if a similar page could be provided for :

System Variable Differences Between MariaDB 10.1 and MySQL 5.6
System Variable Differences Between MariaDB 10.1 and MySQL 5.7

This will help lot of people.