Accessibility improvements + Xcode 4.3 fixes.

[ADDED]     Accessibility hints and labels.

MasterPassword/MPAppDelegate_Store.m

@@ -342,11 +342,12 @@
         element.type     = type;
         element.uses     = uses;
         element.lastUsed = lastUsed;
-        if ([exportContent length])
+        if ([exportContent length]) {
             if (clearText)
                 [element importClearTextContent:exportContent usingKey:key];
             else
                 [element importProtectedContent:exportContent];
+        }
     }
     [self saveContext];
 

MasterPassword/iOS/MPUnlockViewController.m

@@ -122,8 +122,6 @@
     self.spinner.alpha                = 0;
     self.passwordTipView.alpha        = 0;
 
-    [self updateLayoutAnimated:NO allowScroll:YES completion:nil];
-
     [super viewDidLoad];
 }