Author: wehr
MDL-57572 cache: Adds igbinary serializer to Redis cache store
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9c860cea46cb3cec9aa4b271c02aa71c4006c9f6
http://github.com/moodle/moodle/commit/9c860cea46cb3cec9aa4b271c02aa71c4006c9f6
+ 3.3 en [serializer_igbinary,cachestore_redis]
+ 3.3 en [serializer_php,cachestore_redis]
+ 3.3 en [test_serializer,cachestore_redis]
+ 3.3 en [test_serializer_desc,cachestore_redis]
+ 3.3 en [useserializer,cachestore_redis]
+ 3.3 en [useserializer_help,cachestore_redis]