Tweak OAuth2 Flow just a bit.
Tweak OAuth2 Flow just a bit.

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