Summary:
This commit adds the delegate hooks so that local notifications get
passed onto the JS and adds a new event listener type for local
notifications.
Also add functions to clear local notifications
Closes https://github.com/facebook/react-native/pull/2084
Reviewed By: svcscm
Differential Revision: D2908096
Pulled By: nicklockwood
fb-gh-sync-id: 759d299ea35abea177e72934076297d666d3ea20
shipit-source-id: 759d299ea35abea177e72934076297d666d3ea20