add stack for storing UI steps
change comment
Merge branch 'MOB-1543' into MOB-1543-stackForSteps

Conflicts:
	extensions/wikia/WikiaInteractiveMaps/js/WikiaInteractiveMapsCreateMapConfig.js
	extensions/wikia/WikiaInteractiveMaps/js/WikiaInteractiveMapsCreateMapUI.js
Merge pull request #3668 from Wikia/MOB-1543-stackForSteps

Mob 1543 stack for steps