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/base.ex

@@ -44,7 +44,6 @@ defmodule Omnibot.Module.Base do
 
       defp route_msg(irc, msg) do
         nick = msg.prefix.nick
-
         case String.upcase(msg.command) do
           "PRIVMSG" ->
             [channel | params] = msg.params