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

I couldn't pop your bundle in because of the <2.3-dev restriction.  I removed the restriction and the bundle composed in nicely.

Additional updates:
1) I removed `{{ collector.stats.max_cached_scripts }}` as it appears not to exist and caused a twig compilation error.
2) Changed typo: "Parcent" to "Percent"
3) Added some extra stats that were available but not shown
4) Touched up the formatting opcache.memory_consumption and opcache.max_wasted_percentage

I only tested this on the configuration in the title, no other environments.  Works for me, so if you don't want to merge it for any reason, I can continue using the fork I made.  Thanks!