Update README.md

Merge pull request colinmollenhour#138 from colinmollenhour/multiple-…

…read-slaves

Deprecate flawed 'cluster' functionality, add support for multiple st…

Merge pull request colinmollenhour#133 from adioe3/master

Fix lifetimes passed as string "false" from layout XML

Merge pull request colinmollenhour#134 from davidalger/verify-slave-l…

…oad-from-master

Added 'retry_reads_on_master' option for when read slaves are used

Remove needless loading of Credis_Cluster class. Fixes colinmollenhou…

…r#132

Track credis 1.9.1 (fixes PHP <5.6).

Track latest Credis library (1.8.2).

Also send reads to the master when load_from_slaves is '2'.

Merge pull request colinmollenhour#122 from luckyraul/master

Fix auth 1.10

Improve README docs on new HA and load balancing features. Fixes coli…

…nmollenhour#112