Remove YARD since it causes problems with Lion

Gemfile

@@ -12,10 +12,4 @@ group :test do
   gem "rake"
   gem "contest", ">= 0.1.2"
   gem "mocha"
-
-  # For documentation
-  platforms :ruby do
-    gem "yard", "~> 0.6.1"
-    gem "bluecloth"
-  end
 end

Rakefile

@@ -9,14 +9,3 @@ Rake::TestTask.new do |t|
   t.libs << "test"
   t.pattern = 'test/**/*_test.rb'
 end
-
-begin
-  require 'yard'
-  YARD::Rake::YardocTask.new do |t|
-    t.options = ['--main', 'README.md', '--markup', 'markdown']
-    t.options += ['--title', 'Vagrant Developer Documentation']
-  end
-rescue LoadError
-  puts "Yard not available. Install it with: gem install yard"
-  puts "if you wish to be able to generate developer documentation."
-end