Fixed deallocation cleanup

Minor view changes

Sketching path bar to use for search as hint to where the entries are
Some experiments with the filter bar (extracted the view to a separate nib)

MacPass/MPAppDelegate.m

@@ -28,6 +28,11 @@
   [self.mainWindowController showWindow:[self.mainWindowController window]];
 }
 
+- (void)dealloc {
+  self.settingsController = nil;
+  self.mainWindowController = nil;
+}
+
 #pragma mark Menu Actions
 
 - (void)showMainWindow:(id)sender {