Revert "travis likes old bundler"

This reverts commit 1adda31cbc.

Gemfile

@@ -250,8 +250,6 @@ begin
   gem 'memory_profiler', require: false, platform: [:mri_21, :mri_22]
 rescue Bundler::GemfileError
   STDERR.puts "You are running an old version of bundler, please upgrade bundler ASAP, if you are using Discourse docker, rebuild your container."
-  gem 'stackprof', require: false, platform: [:mri_21]
-  gem 'memory_profiler', require: false, platform: [:mri_21]
 end
 
 gem 'rmmseg-cpp', require: false

bin/rails

@@ -1,16 +1,4 @@
 #!/usr/bin/env ruby
-#
-# This file was generated by Bundler.
-#
-# The application 'rails' 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('railties', 'rails')
+APP_PATH = File.expand_path('../../config/application',  __FILE__)
+require_relative '../config/boot'
+require 'rails/commands'

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