Create AFVkontakteLoginViewController; Add webView and close button to AFVkontakteLoginViewController;
Modify AFVkontakteAuthBlock;
Add AFVkontakteClientAdditions category for UIViewController;
topViewController methof in AFVkontakteClientAdditions category now dynamic; Implement show AFVkontakteLoginViewController method;
Add AFVkontakteAdditions category for NSString and NSExpression (tested);