Moved addObservers and removeObservers calls back to viewWillAppear/viewWillDissappear so that we don´t listen for changes when the controllers view is not visible on screen. Also added a workaround in the MainViewController for bug 17291466 (UISplitViewController does not delegate viewWillAppear to master view controller when app is launched in portrait mode).
Fixed crash in EmsSettingsViewController
Removed unused file.