Implement necessary listeners for explaination overlay (start page)

	modified:   app/assets/javascripts/megamind.js
	modified:   app/assets/javascripts/orangeproton.mindmap.js
	modified:   app/assets/javascripts/orangeproton.notification.js
	modified:   app/assets/javascripts/orangeproton.search.js
	modified:   app/assets/javascripts/request.js
Merge branch 'development' of github.com:pse4/orange-proton into development

Conflicts:
	app/assets/javascripts/request.js