[PushNotifications] Add an event for remote notification registration, and improve permissions request#1304

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andrewimm wants to merge 2 commits intofacebook:masterfrom

andrewimm:master

Commits on May 15, 2015

Adding a remote push registration event, and allowing a subset of permissions to be requested
andrewimm
committed

Commits on May 22, 2015

Fix linking errors on prior iOS versions
andrewimm
committed