Make awful.rules mandatory

There was many unfixable race conditions that could only be
solved by better integrating the request:: system and
awful.rules. This has the side effect to make rules mandatory.

awesomerc.lua

@@ -1,7 +1,6 @@
 -- Standard awesome library
 local gears = require("gears")
 local awful = require("awful")
-awful.rules = require("awful.rules")
 require("awful.autofocus")
 -- Widget and layout library
 local wibox = require("wibox")

lib/awful/init.lua

@@ -56,6 +56,7 @@ return
     tooltip = require("awful.tooltip");
     ewmh = require("awful.ewmh");
     titlebar = require("awful.titlebar");
+    rules = require("awful.rules");
     spawn = spawn;
 }