title: iOS 8 Extension for selected text
body: <p>In iOS 8 we can now create extensions which match up with "extension points" in other apps of a few kinds: "Today" extensions that appear as views on the Lock &amp; notifications screens, "share" extensions that can open data and files from other apps, etc. Is it possible to create an extension which will take selected text from another app, and if so how is it done?</p>