Swift 4.2, iOS 12, macOS Mojave 10.14

Now safe for use in application extensions.

This could be a breaking change if you were relying on events
without an explicit object being broadcast from UIApplication (iOS)
or NSApplication (macOS) as the object is now set as nil if not
specified so bumping the version number to 5.0.0.

Reduced deployment target to iOS 9.0

There was no reason for it to be 9.2.

Update to latest project settings in Xcode 8.1

* Compiles with Swift 3.0.1

Update to latest project settings in Xcode 8.1

* Compiles with Swift 3.0.1

Readme updates

Readme updates

Readme updates

Swift 3.0

Added iOS app icon for the demo app.

Updated for Swift 2.2 / Xcode 7.3. Incompatible with earlier versions.

Fixed: Calling destroyNotificationHandler() with nil crashes (#1)

Updated readme to workaround Gitlab Markdown rendering issue.

Fixed a typo on the readme.

Fixed a typo in the code sample in the readme.

Minor copy tweak to the readme.

Minor visual fix to the readme.

Updated the readme with the latest installation instructions and standard readme file structure.

Added the Ind.ie standard ./install and ./dev scripts.