   @spec static(Plug.Conn.t, binary) :: Plug.Conn.t
   def static(conn, file) do
     filename = Path.join(["priv/static", file])
-    if File.exists? filename do
+    if File.exists?(filename) do
       body = filename |> File.read!
       conn
         |> put_resp_content_type_if_not_sent("text/html")

  """
  @spec halt!(Plug.Conn.t, Keyword.t) :: Plug.Conn.t
  def halt!(conn, opts \\ []) do
    opts = [status: 401, message: ""] |> Keyword.merge opts
    conn
      |> send_resp_if_not_sent(opts[:status], opts[:message])
  end

  """
  @spec redirect(Plug.Conn.t, binary, Keyword.t) :: Plug.Conn.t
  def redirect(conn, location, opts \\ []) do
    opts = [status: 302] |> Keyword.merge(opts)
    conn
      |> put_resp_header_if_not_sent("Location", location)
      |> send_resp_if_not_sent(opts[:status], "")
