GNP will now identify itself as Gmail-Notifier-Plus
GNP will now identify itself as Gmail-Notifier-Plus

Gmail Notifier Plus will now identify itself to the GitHub API asi
"Gmail-Notifier-Plus" instead of generic "Shellcape-Updater".
Plus unification of tabs vs. spaces and indentation in Program.cs.

Part of #132.

shellscape/Gmail-Notifier-Plus,tkpb/Gmail-Notifier-Plus