Update composer.json

remove <2.3-dev restriction on symfony/framework-bundle
removed unavailable max_cached_scripts key under stats
fixed Parcent/Percent typo
added missing stats and broke out stats panel
special formatting for opcache.memory_consumption and opcache.max_wasted_percentage
Merge pull request #1 from ambry/master

Update for new versions: Symfony 2.4.2, PHP 5.5.10, Zend Opcache 7.0.3