Revert "travis likes old bundler"

This reverts commit 1adda31cbc.

bin/rake

@@ -1,16 +1,4 @@
 #!/usr/bin/env ruby
-#
-# This file was generated by Bundler.
-#
-# The application 'rake' is installed as part of a gem, and
-# this file is here to facilitate running it.
-#
-
-require 'pathname'
-ENV['BUNDLE_GEMFILE'] ||= File.expand_path("../../Gemfile",
-  Pathname.new(__FILE__).realpath)
-
-require 'rubygems'
-require 'bundler/setup'
-
-load Gem.bin_path('rake', 'rake')
+require_relative '../config/boot'
+require 'rake'
+Rake.application.run