anchor.diff:  
   ## Friends [/{year}/{sem}/friends]
   
  -### Get connected friends [GET]
  +### Get users who take same modules [GET]
   
   + Response 200 (application/json)
   
  
positive.code: ### Get team info [GET]
  
  This request needs a date query.
  E.g. /team/id?date=2016-09-07
  
  + Response 400 (application/json)
  
  
negative.code:         
  ## Team Collection [/{year}/{sem}/team]
  
  ### List all teams I belong to [GET]
  
  + Response 200 (application/json)
  
  