anchor.diff:  + Response 200
   
           {
  -            id: "12a34f5"
  +            group: "12a34f5"
           }
           
   + Response 204
   
   + Response 400
   
  +### Remove a user from a group [DELETE]
  +Removes the identified user from a group. 200 if it succeeds, 204 if the group 
  +ID was not valid, 400 if the groupid or userid were not specified.
   
  +See issue [#7](https://github.com/tidepool-org/armada/issues/7).
   
  ++ Request
  +
  +    + Headers
  +    
  +            x-tidepool-session-token : 23sadf87.123840.aasd90JKj
  +            
  +    + Body
  +        
  +            {
  +                "userid": "12363523"
  +            }
  +
  ++ Response 200
  +
  +        {
  +            group: "12a34f5"
  +        }
  +        
  ++ Response 204
  +
  ++ Response 400
  +
  +## Group Members [/{groupid}/members]
  +### Fetch the list of members in a group [GET]
  +Returns the members of a given group. If found, returns
  +an object containing an array of members. If the group was not found, 
  +status is a 204. 
  +
  +See issue [#7](https://github.com/tidepool-org/armada/issues/7).
  +
  ++ Request
  +
  +    + Headers
  +    
  +            x-tidepool-session-token : 23sadf87.123840.aasd90JKj
  +            
  +
  ++ Response 200
  +
  +        {
  +            groups: [ "12a34f5", "13bdc814" ]
  +        }
  +        
  ++ Response 204
  +
  ++ Response 400
  +
  
positive.code:         }
  
  ## User Membership [/membership/{userid}/member]
  ### Fetch group membership information [GET]
  Returns the groups that the given userID is a member of. If found, returns
  an object containing an array of groups. If there are no groups, the response 
  is a 204 (rather than an empty array). 
  
negative.code: 
  ## Managing group members [/{groupid}/user]
  ### Add a user to a group [POST]
  Puts the identified user into a group. 200 if it succeeds, 204 if the group 
  ID was not valid, 400 if the groupid or userid were not specified.
  
  See issues [#7](https://github.com/tidepool-org/armada/issues/7) and [#8](https://github.com/tidepool-org/armada/issues/8).
  
  + Request
  
  