Support for Angular 2/4

[kapiladiyecha]

Any plan to support angular 2/4?

[CD-UNCC]

The shortage of really good json tree viewers for 2/4 is apparent and this directive looks great. Nice work regardless

[awendland]

I am no longer an Angular user anymore, and with a recent focus on startup activities, I have less time than I'd like to maintain this project and add new features. PRs to support it are appreciated (though it looks like I'm quite bad at merging them), and a co-maintainer for the project is even more greatly appreciated!