Merge pull request #2 from abomb4/master

完成user_model的login()；修复create_table.sql的创建用户BUG
调整user表中identity各数字的含义&修复create_table表中insert默认管理员bug
修复identity默认值bug
添加了一个美(lan)如(da)画(jie)的后台界面
Merge pull request #3 from abomb4/database

调整user表中identity各数字的含义&修复create_table表中insert默认管理员bug
修改了后台界面
Merge branch 'master' of https://github.com/szqsyt0/ITws

Conflicts:
	Database/create_table.sql
bug

调用login提示Call to a member function get_where() on a non-object in
/Users/syt/Sites/ITws/application/models/user_model.php on line 96
user_model里的login函数有问题
merged