code: def _dict_from_dotted(key, val):
      
      split_key = key.split(".")
      split_key.reverse()
      for key_part in split_key:
          new_dict = DotDict()
          new_dict[key_part] = val
          val = new_dict
      return val
docs: takes a key value pair like:
      key: "this.is.a.key"
      val: "the value"
  
      and returns a dictionary like:
  
      {"this":
          {"is":
              {"a":
                  {"key":
                      "the value"
                  }
              }
          }
      }