- Xcode 10 (already supported)
- merged the framework targets into multi-platform ones
- using xcconfig for most of the configurations (Lumberjack.xcodeproj + Tests.xcodeproj + Demos) - only adding setting in xcodeproj where they are not valid for all the other targets
- set deployment target to iOS8 and Mac OS 10.10 - also cleaned up some branched code for the earlier versions
- updated Travis scripts