Log Message:
Update redis to 2.4.13.

Changes in 2.4.13
* [BUGFIX] Fix for KEYS command: if the DB contains keys with expires the KEYS
           command may return the wrong output, having duplicated or missing
           keys. See issue #487 and #488 on github for details.

Changes in 2.4.12
* [BUGFIX] Limit the amount of memory consumed by the slow log.
* [BUGFIX] --test-memory option fixes.
* [BUGFIX] Less false positives in tests.

Changes in 2.4.11
* [BUGFIX] Fixed a problem with aeWait() implementation. May cause a crash
           under non easy to replicate condiitons. See issue #267 on github.
* [BUGFIX] SORT with GET/BY option fetching expiring keys fixed. Issue #460.
* [BUGFIX] INFO field master_link_down_since_seconds initialized correctly.
* [FEATURE] redis-cli back ported from Redis unstable. Now has support for
            --bigkeys (to sample the DB for very large keys), --slave to
            simulate a slave instance.

Changes in 2.4.10
* [FEATURE] Redis --test-meory improved with new test testing addressing.
* [BUGFIX] Fixed a memory leak: happens when replication is used with DB > 9.
* [BUGFIX] Fixed a replication bug that happens in chained replicaiton when
           a slave is attached to a master that is later turned into a slave.
           Now the chained slave reconnection is properly forced.