Skip Annotaion classes in the caching

[lvismer]

Using form Annotation in Entities was not working as comments are being dropped.

Just a quick addition to skip Zend classes, particularly Zend\Form\Annotation*

[GarethChidgey]

Thanks for this @lvismer, fixed it for me!

[snapshotpl]

@lvismer looks great! @EvanDotPro we need to merge this to master (and create a tag)! 👍

[Colmea]

+1, need this :)
ping @EvanDotPro