Merge pull request #13 from rw1993/master

link to mongodb and I think now Li should design activityList.html
Merge pull request #14 from rw1993/master

new sql describe
the activityList is finished
Merge pull request #15 from Narcssus/master

the activityList is finished
Merge pull request #16 from rw1993/master

change newclass.py to new database_desigh
get activitiyORG in activity.currentActivity
almost finish activityList.html and find some small bugs