The web server of ITalker.
/login/
/register/
/bind/
/editProfile/
/getContact/
/follow/
/search/
/receiveMsg/
/msgList/
/groupDetail/
BaseService: the base class of all services.
AccountService：services for all account information.
UserService：services for all contact information.
MessageService：services for all messages.
GroupService：services for all group chatrooms.
