Use UserNotifications to create/dismiss local notifications

a15e038a adds support for enumerating/dismissing delivered notifications
by ID, but UserNotifications notifications and UILocalNotification
notifications have a different set of IDs (a notification created using
UILocalNotification will have an ID that does not match the
notification's ID in the UserNotifications world and hence cannot be
used to dismiss that notification). This commit creates the
notifications using UserNotifications if the user is on iOS 10.

Add iOS checkPermissions

Add a checkPermissions function allowing the app to determine what
notification permissions the user has granted. The function returns a
promise resolving to an object with permission info.

Missing bracket on example

Update README.md

Fix flow errors

iOS API - Is registered for remote notifications

Fix: Handling first push notification (when opening app with push)  without remove it from bridgeQueue, cause triggering same action multiple times.

RN 0.40 support

Fix improper reference in readme.

Typ-o regsitered