WIP: Wordbot

Wordbot is a little more complex of a bot module and I've been working
on it here.

Other than wordbot module, a few minor tweaks have been added all around
that don't really affect anything.

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

lib/util.ex

@@ -2,4 +2,8 @@ defmodule Omnibot.Util do
   def string_empty?(s), do: String.length(s) == 0
 
   def string_or_nil(s), do: if(string_empty?(s), do: nil, else: s)
+
+  def now_unix, do: now_unix("Etc/UTC")
+
+  def now_unix(tz), do: DateTime.now!(tz) |> DateTime.to_unix()
 end