Add openflow enum generator

lib/openflow/echo/reply.ex

@@ -19,6 +19,7 @@ defmodule Openflow.Echo.Reply do
       data: options[:data] || ""
     }
   end
+
   def new(data) when is_binary(data) do
     %Reply{data: data}
   end

lib/openflow/echo/request.ex

@@ -19,6 +19,7 @@ defmodule Openflow.Echo.Request do
       data: options[:data] || ""
     }
   end
+
   def new(data) when is_binary(data) do
     %Request{data: data}
   end

lib/openflow/table_mod.ex

@@ -18,6 +18,7 @@ defmodule Openflow.TableMod do
       table_id: options[:table_id] || 0
     }
   end
+
   def new(table_id) when is_integer(table_id) or is_atom(table_id) do
     %TableMod{table_id: table_id}
   end