add user
add user
add permission module
complete the views
Update README.md

添加说明文档
Update README.md
Update README.md
motify some function in user permission manager
Merge branch 'user' of https://github.com/wenxuan-xia/net_info_publisher-SE_1_5 into user
commit the init tool to create databases
motify the README
Merge branch 'user' of https://github.com/wenxuan-xia/net_info_publisher-SE_1_5

Conflicts:
	README.md
	application/config/database.php