修改domain设计,将admin为家长的类型抽出到学生表,因唯一约束为学生姓名和家长手机号,故单表已可实现多对多,且方便验证,已与徐兄讨论过.
Merge branch 'master' of https://github.com/limingxu/JXT.git

Conflicts:
	jxt/src/com/jxt/entity/Student.java