Simple tutor: press rightclick to start.
Dialog sequence showing boilerplate.
Working version of dialog sequence with "Skip"
Start tutor button functionality
Make the dialogs modal.
Fix general/specific options management

The old way the commonOptions was modified, which lead to weird effects.
Save cookie for finishing of the tutor.
New tutor text stub.
Hide the 'close' button to reduce confusion
Make dialogs non-modal. Correct restart.
Merge branch 'master' into intro-tutor

Conflicts:
	css/index.css

Pulling changes from master to prepare tutor.
Show only the "rightclick" tutor.