Added log4net library
Configured log4net, implemented login infrastructure in the ViewModel base class
Implemented logging in the LoginViewModel (login process)
Implemented logging in the MainViewModel
Reconfigured the logfile filename format
Implemented logging for the download process
Fixed logfile issue
Enhanced logging of the playlist/track add and remove processes
Implemented logging in the rest of the application
Resolved conflicts
Merge pull request #20 from Mostey/logging

Logging
add icon
Merge branch 'master' of https://github.com/greensn0w/loadify