Add a cardNavigationBarClass configuration option

Apple introduce in iOS5 a new `UINavigationController` method
`initWithNavigationBarClass:toolbarClass:` to properly customize the
navigation bar used. I think it's important that we can control that
aspect.

Classes/KLNoteViewController.h

@@ -62,6 +62,9 @@ typedef UInt32 KLControllerCardPanGestureScope;
 @property (nonatomic, assign) id<KLNoteViewControllerDataSource> dataSource;
 @property (nonatomic, assign) id<KLNoteViewControllerDelegate> delegate;
 
+//Navigation bar properties
+@property (nonatomic, strong) Class cardNavigationBarClass; //Use a custom class for the card navigation bar
+
 //Layout properties
 @property (nonatomic) CGFloat cardMinimizedScalingFactor;   //Amount to shrink each card from the previous one
 @property (nonatomic) CGFloat cardMaximizedScalingFactor;   //Maximum a card can be scaled to

Classes/KLNoteViewController.m

@@ -71,6 +71,8 @@ - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
 }
 
 - (void)configureDefaultSettings {
+    self.cardNavigationBarClass = [UINavigationBar class];
+
     self.cardMinimizedScalingFactor = kDefaultMinimizedScalingFactor;
     self.cardMaximizedScalingFactor = kDefaultMaximizedScalingFactor;
     self.cardNavigationBarOverlap = kDefaultNavigationBarOverlap;
@@ -143,7 +145,9 @@ - (void) reloadData {
     for (NSInteger count = 0; count < totalCards; count++) {
         UIViewController* viewController = [self noteView:self viewControllerForRowAtIndexPath:[NSIndexPath indexPathForRow:count inSection:0]];
 
-        UINavigationController* navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
+        UINavigationController* navigationController = [[UINavigationController alloc] initWithNavigationBarClass:self.cardNavigationBarClass
+                                                                                                     toolbarClass:[UIToolbar class]];
+        [navigationController pushViewController:viewController animated:NO];
 
         KLControllerCard* noteContainer = [[KLControllerCard alloc] initWithNoteViewController: self
                                                                                     navigationController: navigationController