ivy学习
经典资料：
http://www.blogjava.net/aoxj/category/37028.html
其他资料：
http://www.blogjava.net/aoxj/archive/2009/03/31/263012.html
http://blog.csdn.net/zhaoyue007101/article/details/46563847
http://ivy.group.iteye.com/group/wiki/1946-ivy-tutorials-adjusting-default-settings