Add Support for getting the current users teams.
Add Support for getting the current users teams.

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