dartium 38663 (new formula)

Added suport to install the latest stable dartium browser from
https://www.dartlang.org. The browser is used to develop dart
applications and is common installed with the dart sdk provided by
dart.rb Formula
We are thinking about a homebrew-dart tap in github.com/dart-lang. If we have our own tap, it won't show up in brew search? Is there any way to add our tap to your list of taps, without being in the Homebrew org?