Adding zoom function to slideshow images
Upgraded dependency injection. No longer have to list class dependencies in site config file, now make a class implement an 'Aware' interface and Initialize all classes as per ZF2 style. Album and Image models now implement MemcachedManagerAwareInterface, and dependencyContainer is aware of MemcachedManagerAwareInitializer and makes sure that those 2 models (and any others that implement the Aware interface in the future) have the memcached manager injected into them.
Fixed bug in error handler that was missing off the top element in the callstack. Now get complete callstacks including the file where the error was logged.