Revert "Remove bundler binstubs"

This reverts commit 7209d10aaf12875ce05bf21db967b27e7594ac38.

  It appears rails now depends on this for various aspects :-(

bin/bundle

@@ -0,0 +1,4 @@
+#!/usr/bin/env ruby
+
+ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
+load Gem.bin_path('bundler', 'bundle')

bin/rails

@@ -0,0 +1,5 @@
+#!/usr/bin/env ruby
+
+APP_PATH = File.expand_path('../../config/application', __FILE__)
+require_relative '../config/boot'
+require 'rails/commands'

bin/rake

@@ -0,0 +1,5 @@
+#!/usr/bin/env ruby
+
+require_relative '../config/boot'
+require 'rake'
+Rake.application.run