GitLab

* Compiles with Swift 3.0.1

Add team so it builds on device.

Fix spacing in code example.

Fix space in heading for GitLab render.

Also update the readme.

* Clean up code
* Update dependencies
* Update OS X → macOS naming

And also update the resolved Cartfile.

Clarify where the installation code should go.

Also update the readme to note that this is the Swift 2.3
branch and inform about other available branches.

(No source changes are necessary. Updates project files.)

Made the cartfile private as it is only necessary for the demo apps and not for the framework itself.

The demo apps now add the framework not via Carthage (leading to haning installs/infinite recursion?).