Resolves #1, fixing snackbars for use with modally presented view controllers

Author: stonesam92

Pod/Classes/SSSnackbar.m

@@ -101,8 +101,13 @@ - (void)drawRect:(CGRect)rect {
 }
 
 - (void)show {
+    UIViewController *topController = [UIApplication sharedApplication].keyWindow.rootViewController;
+    while (topController.presentedViewController) {
+        topController = topController.presentedViewController;
+    }
+    
+    UIView *superview = topController.view;
 
-    UIView *superview = [UIApplication sharedApplication].delegate.window.rootViewController.view;
     BOOL shouldReplaceExistingSnackbar = currentlyVisibleSnackbar != nil;
 
     if (shouldReplaceExistingSnackbar) {