Added documentation to the following file

	modified:   mango.data.exceptions/MEntityNotFoundException.php
	modified:   mango.data.exceptions/MInvalidManagedObjectOperationException.php
	modified:   mango.data.exceptions/MManagedObjectException.php
	modified:   mango.system/MApplication.php
Merge branch 'jaderfeijo-dev' of https://github.com/jaderfeijo/mango-system into jaderfeijo-dev