Add Yii as submodule
Merge pull request #24 from jarmokortetjarvi/yii

Add Yii as submodule
Modify site layout
Remove obsolete image
Modify main menu colors
Add user authentication
Add database user authentication
Add user authentication
Add user model
Modify main menu structure
Modify site contents
Merge pull request #25 from jarmokortetjarvi/backend

Add light user access control