Rakefile in pdfmonkey-0.4.0 vs Rakefile in pdfmonkey-0.5.0

@@ -1,6 +1,20 @@
-require 'bundler/gem_tasks'
+require 'rubygems'
+
+begin
+  require 'bundler/setup'
+rescue LoadError
+  puts 'You must `gem install bundler` and `bundle install` to run rake tasks'
+end
+
+require 'bundler'
+Bundler::GemHelper.install_tasks
+
+require 'rake'
 require 'rspec/core/rake_task'
 
-RSpec::Core::RakeTask.new(:spec)
+desc "Run all examples"
+RSpec::Core::RakeTask.new(:spec) do |t|
+  t.rspec_opts = %w[--color --require spec_helper]
+end
 
 task default: :spec