Fixed midpoint and added some tests

framer/Layer.coffee

@@ -520,12 +520,14 @@ class exports.Layer extends BaseClass
			x: @midX
			y: @midY
		set: (input) ->
			if input.x?
				input.midX = input.x
				delete input.x
			if input.y?
				input.midY = input.y
				delete input.y
			if not _.isNumber input
				input = _.pick(input, ["x", "y", "midX", "midY"])
				if input.x? and not input.midX?
					input.midX = input.x
					delete input.x
				if input.y? and not input.midY?
					input.midY = input.y
					delete input.y
			input = layerPropertyPointTransformer(input, @, "midPoint")
			@_setGeometryValues(input, ["midX", "midY"])

test/tests/LayerTest.coffee

@@ -1544,6 +1544,46 @@ describe "Layer", ->
				layerA.x.should.equal 137
				layerA.y.should.equal 283

	describe "midPoint", ->
		it "should accept a midX/midY value", ->
			l = new Layer
				midPoint:
					midX: 123
					midY: 459
			l.midX.should.equal 123
			l.midY.should.equal 459
		it "should accept a x/y value", ->
			l = new Layer
				midPoint:
					x: 123
					y: 459
			l.midX.should.equal 123
			l.midY.should.equal 459

		it "should accept a single number", ->
			l = new Layer
				midPoint: 234
			l.midX.should.equal 234
			l.midY.should.equal 234
		it "should pick midX/midY over x/y", ->
			l = new Layer
				midPoint:
					midX: 123
					midY: 459
					x: 653
					y: 97
			l.midX.should.equal 123
			l.midY.should.equal 459
		it "should not change the object passed in", ->
			l =
				x: 100
				y: 200
			m = new Layer
				midPoint: l
			m.midX.should.equal l.x
			m.midY.should.equal l.y
			l.x.should.equal 100
			l.y.should.equal 200
	describe "CSS", ->

		it "classList should work", ->