Test case for #1637
Use zend_update_property for dynamic properties

Fix #1637

Conflicts:
	ext/di/injectable.c
Phalcon\Session\Bag fixes

  * initalized => initialized
  * add initialization check to remove()
  * be less aggressive in __construct()
Updated changelog
Regenerated build/
Merge pull request #1640 from sjinks/1.2.5

[1.2.5] Fix #1637