tvOS support 📺 + Carthage 🔧 + Custom snapshot names ㊔

Another minor release with some good stuff on it

• @dcordero added support for tvOS support #17 📺
• @vojtechvrbka added support for Carthage #19 🔧

Also, I've added support for custom snapshot names, now you can take many screenshots from a test case using custom names as:

 expect(view).toMatchSnapshot(named: "custom_name") // Reference image will be stored with this name

To end, @rnystrom found an issue 🐛 when generating snapshots in projects with spaces on directory #22

Thanks everyone involved ✨