commitmonitor Code

* allow only one instance per user
* add a tray icon

* get rid of the boost serialization (that one crashed and I couldn't figure out why), implement our own serialization instead.
* Implement timers and threads to fetch the log data and check for updates according to the settings.
* Implement username/password to pass to the repository if necessary.

Add a hidden 'main' window which handles the window messages and the icon in the tray area.