Update EM->trigerUntil to be an alias of trigger

They contained the exact same code/logic. The only difference was the
conditional around checking if the callback was valid, but the outcome
is the same for both. This simply reduces duplicate code and causes no
change in behavior at all.
Deprecate EventManager->triggerUntil() method
Merge branch 'hotfix/em-triger-triggeruntil' of https://github.com/EvanDotPro/zf2 into EvanDotPro/hotfix/em-triger-triggeruntil

Conflicts:
	library/Zend/EventManager/EventManager.php
updated docblock of EventManager::trigger() to describe callback argument and remove reference to deprecated triggerUntil()
Deprecated GlobalEventManager::triggerUntil()
updated unit tests of EventManager to reflect deprecated triggerUntil methods