Network Reachability in Swift

[pxlshpr]

Have an up to date document that shows us how to do this: https://www.invasivecode.com/weblog/network-reachability-in-swift/?doing_wp_cron=1475700491.2077538967132568359375

[pxlshpr]

• [ ] Create a blogpost entry that will cover the current state of reachability in Swift and plan to keep it up to date (for example, when Swift 4 comes out)
• [ ] Create a task of checking and updating our codebase when changes to Swift occur (and have these tied to the Swift roadmap)
• [ ] Add this to Toolbelt with tests