def load_tokens
      if File.exists?(TOKEN_PATH)
        f = File.open(TOKEN_PATH, 'r')
        tokens = YAML::load(f)
        f.close
        tokens
      end
    end
def load_tokens
      if File.exists?(TOKEN_PATH)
        f = File.open(TOKEN_PATH, 'r')
        tokens = YAML::load(f)
        f.close
        tokens
      end
    end
Load tokens from the ~/.twitter file