Fix the accept button, TODO: add accept permission check, add complete button, add accepted quest, add user icon, add server part
Change the assigner and assignee to array format. Incomplete implementation.
July 9
DEBUG
DEBUG
Shui zhao yi hou xie de
Merge branch 'master' into 1-2

Since the master branch used NSArray to store user info and doesn't work at all. As we add a server to take care of client request, we do not need the NSArray any more.