If a git path in a pubspec is relative interpret it relative to the pubspec #449
Description
<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="96" height="96"hspace="10"> Issue by munificent
Originally opened as dart-lang/sdk#8570
You can use a file path as a git dependency. When you do, it's interpreted as relative to the package directory of the root package. It should be resolve as relative to the pubspec that contains the dependency (like relative path deps are).