upgrade to newest activesupport

middleman-core/lib/middleman-core/application.rb

@@ -11,7 +11,6 @@ require 'i18n'
 # Use ActiveSupport JSON
 require 'active_support/json'
 require 'active_support/core_ext/integer/inflections'
-require 'active_support/core_ext/float/rounding'
 
 # Simple callback library
 require 'hooks'

middleman-core/lib/middleman-core/logger.rb

@@ -1,12 +1,12 @@
 # Use the Ruby/Rails logger
 require 'active_support/notifications'
-require 'active_support/buffered_logger'
+require 'active_support/logger'
 require 'thread'
 
 module Middleman
 
   # The Middleman Logger
-  class Logger < ActiveSupport::BufferedLogger
+  class Logger < ActiveSupport::Logger
 
     def self.singleton(*args)
       if !@_logger || args.length > 0