Ship pre-compiled binaries

[oddrationale]

It would be nice to ship with pre-compiled binaries like how node-sass does. That way, once the package is published to pub, user won't have to manually compile the extension.

[oddrationale]

There may be blocking issues in Dart. See https://code.google.com/p/dart/issues/detail?id=3023

[oddrationale]

This DEP looks like a potential solution if it can import based on the platform and architecture:
dart-archive/dart_enhancement_proposals#6

We can then ship compiled binaries in specific subfolders and use the import URI to specify which extension to load based on the platform and architecture.