Add code for showing popup screen. It will be updated.
Implement generic popup dialog.
Merge branch 'master' of https://github.com/SeongHyeok/PICNIC

Conflicts:
	Olinopoly/olinopoly.py
Merge branch 'master' of https://github.com/SeongHyeok/PICNIC

Conflicts:
	Olinopoly/olinopoly.py
Merge branch 'master' of https://github.com/SeongHyeok/PICNIC