Add builder.

lib/treat.rb

@@ -18,5 +18,6 @@ module Treat
   require_relative 'treat/exception'
   require_relative 'treat/autoload'
   require_relative 'treat/modules'
+  require_relative 'treat/builder'
 
 end

lib/treat/builder.rb

@@ -0,0 +1,7 @@
+class Treat::Builder
+  def initialize(&block)
+    i = 'include Treat::Core::DSL'
+    eval(i, block.binding)
+    block.call
+  end
+end