add history funciton for task and sprint
add /API/p/:pid/members  API for android develop
Merge branch 'server' of github.com:tongji-qqg/EasyAgile into android
invite user modify, can use id or email to invite proeject member
项目主页增加历史记录模块

aaa
Merge branch 'server' of github.com:tongji-qqg/EasyAgile into android
add basic alert function
Merge branch 'server' of github.com:tongji-qqg/EasyAgile into server
merge with history page
Merge branch 'server' of github.com:tongji-qqg/EasyAgile into android
未完成：

1. 头像载入没有完全做好；
2. actionBar上的增、删、分类查看等操作没做；
*3. 消息没做
*4. 历史记录没做
今天继续写1，明天写2