Merge pull request #640 from magento-jackalopes/pr

Issues Fixed:

- MAGETWO-58446 Remove uses of unserialize in usages of \Magento\Framework\Cache\FrontendInterface::load()
- MAGETWO-58450 Remove uses of unserialize in usages of \Magento\Framework\App\CacheInterface::load()
- MAGETWO-58680 Remove uses of unserialize in usages of \Magento\Framework\Cache\FrontendInterface::load() 2
- MAGETWO-60442 Add optional SerializerInterface dependency to child classes of \Magento\Framework\Config\Data
- MAGETWO-60353 Replace json_decode in \Magento\Framework\ObjectManager\DefinitionFactory::_unpack with SerializerInterface