Revert 604eb92..8bc831a

This rolls back to commit 604eb92fdff90b434b0dc01098263cd09a556d03.
Revert "layers에 scroll 기능 추가"

Conflicts:
	.gitignore
	Gruntfile.js
	assets/app.js
	assets/model/concept.js
	assets/model/entity.js
	assets/model/ideamap.js
	assets/model/relation.js
	assets/prototype2.js
	assets/view/conceptView.js
	assets/view/relationView.js
	package.json
	prototype2.html
	test/UnitTest.html
	test/testSuite.js
	test/unit/ideaMapTest.js
	test/unit/relationTest.js