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Summary:
NSExtensionContext's -openURL:completionHandler: doesn't open URLs and passes success = NO in its completionHandler when it's called from the Action Extension; no matter what kind of URL is used. I tested it with:
- http:// URLs
- mailto: URLs
- custom URL scheme

This method would be really useful with custom URL schemes, for example we could redirect the user to preferences or help inside the app.

If it's an expected behavior, then the documentation should note that this method doesn't work with Action extensions.

Steps to Reproduce:
1. Create an iOS 8 app and add an Action Extension to it
2. in ActionViewController -viewDidLoad add:
        [self.extensionContext openURL:[NSURL URLWithString:@"http://maps.apple.com/?q=cupertino"] completionHandler:^(BOOL success) {
            NSLog(@"%d", success);
        }];
3. Attach debugger to the extension process

Expected Results:
Maps.app should be opened and `success` should equal YES

Actual Results:
Maps.app isn't opened, `success` equals NO

Version:
iOS 8 beta 2

Configuration:
iOS Simulator, iPad 3