Merge pull request #9 from rexim/master

Bot's nickname as configuration's parameter.
Project: removed the IDEA project file. Closes #2.
Merge remote-tracking branch 'origin/master'
Messenger: ignore messages from history.
LogParser: stopping after reading logs. Closes #8.
Project: fixed actor initialization.
UserRole: converted case classes to case objects. Closes #7.
RoomUser: used ask instead of tell. Closes #6.
Added initial code for the pet extension.