Added logging system

Multi appender logging system. To configure different appenders, add the related appender .config file in Config folder, now it contains text output and mssql storage.
This saved my overnight: http://stackoverflow.com/questions/5556356/log4net-not-inserting-into-the-database .
To see it working, go to Components/Logging, there you can enter different types of events and simulate its event description. Also, it is possible decorate any Class or Method with the Log attribute and the magic works.