New storage en memory: appInstance
Marionette regions: destroy previous currentView before init new view
New onDestroyStoreModel to store toJSON in storage.appInstance
Revert "New onDestroyStoreModel to store toJSON in storage.appInstance"

This reverts commit c4023571b5457b2e89a929e91816b488bee9492b.
New onDestroyStoreModel to store in utils.storage.appInstance on destroy view