angular/angular.dart — pull request #1021 by caitp (2014-05-08 18:28:09+00:00)
Title: docs(Scope): explain `::` and `:` expression notation

A similar feature to these is being proposed for angular.js, and I was trying to see if I could
match the syntax for it from Angular.dart.

But I was a bit shocked that I couldn't find this feature documented anywhere, and I thought it
might be useful for angular.dart app developers to be able to read about this in the docs.