Merge tag 'v1.2.0'

1.2.0
Update the deps
Add missing mongodb dep
Update apns.js
Merge pull request #33 from dahinir/patch-1

Update apns.js
Update the Apple credentials and app id
Merge pull request #34 from strongloop/feature/update-certs

Update the Apple credentials and app id
gcm: fix `devicesGone` event

Fix the GCM provider to send an array of registration ids in the first
argument of `devicesGone` event.

Close #36, close #37.
v1.2.1
Merge branch 'release/1.2.1' into production