Refactoring cache engines to store logger instance
Updating symfony to 2.2 and adding psr-3 logger in composer.json
Updating AbstractEngine to use Psr logger instance
Adding logger for the cache bundle
Updating cache logging, composer update
Adding log statements to ApcEngine
Adding support for application environment for selective logging in cache logger
Adding logging to the FileEngine component
Adding logging to the MemcachedEngine component
Adding missing return statement in method wrapper for sanitizer
Merge branch 'cache-logging'