Permission refactoring
Refactored destroy action in media_resources_controller
TO BE REVEDTED :delete => :manage
Fixed contr media_resources/delete_spec.rb wrt manage for delete
Revert "TO BE REVEDTED :delete => :manage"

This reverts commit e671564ddc354a968d8b420b71628b80e13a28b3.
Refactored authorized on user to accept :delete action