Rediska 0.5.8

• Improvement: Zend queue adapter: avoid subsequent identical queries on existing queues set. Max Ivanov
• Improvement: Allow subsecond accuracy when reading from pubsub. Shyru
• Improvement: Composer autoloader now use psr-0 path. zircote
• Bug: Remove vm-enabled no from redis.conf. Shyru
• Bug: Unbreak travis by fixing the location of the ZF download. till
• Bug #75: Fixing issue with Rediska_Serializer_Adapter_Json::unserialize method not return unserialized value, trickeyone