anchor.diff:  
   + Response 422 (application/json)
   
  -        {"errors":{"name":["can't be blank"]]}}
  +        {
  +          "errors":{
  +            "name":[
  +              "can't be blank"
  +            ]
  +          }
  +        }
   
   + Response 403 (application/json)
   
  
positive.code: 
  + Response 422 (application/json)
  
          {"errors":{"name":["has already been taken"]}}
  
  ## /tags/{id}
  
  
negative.code: 
  + Response 200 (application/json)
  
          {
            "tag":{
              "id":3,
              "name":"bike",
              "total_projects":4,
              "visible":true
            }
          }
  
  
  ### Destroy a tag [DELETE]
  
  