Releasing 4.0.0

Update min deployment version to 9.0

Removing 'aps' key requirement from push payload.

Forwarding invalidate push delegate methods to daemon.

Updated to Swinject 2 and SwinjectPropertyLoader 1.

Update Gorgon.podspec

Updating major version due to breaking changes.

Allow extension

2.1.0

bumping ver

Releasing 2.0.0

Swift3 support.