一个简单的请假流程，网页只显示html，没有复杂的js和css，方便大家理解
权限管理使用apache shiro
推荐使用Activiti Eclipse BPMN 2.0 designer 编辑和查看src\main\resources\leave.bpmn
使用MySQL数据库
使用 Activiti 中的创建表的脚本和本项目下 doc/create table.sql 创建数据表，然后执行table data.sql
| 用户名 | 密码 | 角色 |
|---|---|---|
| user01 | 123456 | 员工 |
| user02 | 123456 | 部门领导 |
| user03 | 123456 | 人事 |
注意：Activiti ACT_ID_GROUP 和 ROLE 所起到的作用不一样，ROLE是apache shiro用到的角色，ACT_ID_GROUP是Activiti中流程用到的角色，
在实际开发过程中需要同步这两张表，或者让Activiti使用ROLE的视图，让用户不用维护两套角色
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