add :require => false to all Gemfile gems

Author: Joshua Hoblitt

Gemfile

@@ -6,9 +6,7 @@ else
   gem 'puppet', :require => false
 end
 
-gem 'rake'
-gem 'puppetlabs_spec_helper'
-gem 'puppet-lint'
-gem 'puppet-syntax'
-
-# vim:ft=ruby
+gem 'rake',                   :require => false
+gem 'puppetlabs_spec_helper', :require => false
+gem 'puppet-lint',            :require => false
+gem 'puppet-syntax',          :require => false