Polish off wordbot implementation, add Omnibot.Module.GenServer

Wordbot implementation now uses the new Omnibot.Module.GenServer module,
which uses a GenServer instead of an Agent. This way, the module can
receive messages and makes storage a little easier.

Beyond that, minor changes all around.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

lib/module/agent.ex

@@ -1,15 +1,12 @@
 defmodule Omnibot.Module.Agent do
   defmacro __using__([]) do
     quote do
-      import Omnibot.Module.Agent
       alias Omnibot.Module
       use Agent
 
       def start_link(opts) do
         cfg = opts[:cfg]
         state = opts[:state] || on_init(cfg)
-
-        IO.inspect({__MODULE__, state})
         Module.Agent.start_link(cfg, state, opts)
       end
 
@@ -18,7 +15,7 @@ defmodule Omnibot.Module.Agent do
 
       def update_state(update, timeout \\ 5000),
         do: Module.Agent.update_state(__MODULE__, update, timeout)
-      end
+    end
   end
 
   def start_link(cfg, state, opts) do