图片优化。
Merge branch 'tem' of https://github.com/Kanvas/Kanvas into xj
修正线条占位矩形算法。
Merge branch 'tem' of https://github.com/Kanvas/Kanvas into xj

Conflicts:
	Core/src/util/CoreUtil.as
	Core/src/view/elementSelector/ElementSelector.as
	KPlayer/src/landray/kp/maps/main/elements/Element.as