Added an example use of the OAuth2 Flow
Added an example use of the OAuth2 Flow

marcojakob/github.dart,bwu-dart-contributing/github.dart,kasperpeulen/github.dart,kasperpeulen/github.dart,bwu-dart-contributing/github.dart,bwu-dart-contributing/github.dart,kasperpeulen/github.dart,marcojakob/github.dart,kasperpeulen/github.dart,marcojakob/github.dart,bwu-dart-contributing/github.dart,marcojakob/github.dart