Remove documentation generation rake task

YARD is preferred, but having a rake task is redundant since
documentation can be generated by running `yard`.

.yardopts

@@ -0,0 +1,4 @@
+--title "Uglifier"
+-
+CHANGELOG.md
+LICENSE.txt

Rakefile

@@ -6,16 +6,6 @@ RSpec::Core::RakeTask.new(:spec) do |spec|
   spec.pattern = FileList['spec/**/*_spec.rb']
 end
 
-require 'rdoc/task'
-Rake::RDocTask.new do |rdoc|
-  version = File.exist?('VERSION') ? File.read('VERSION') : ""
-
-  rdoc.rdoc_dir = 'rdoc'
-  rdoc.title = "uglifier #{version}"
-  rdoc.rdoc_files.include('README*')
-  rdoc.rdoc_files.include('lib/**/*.rb')
-end
-
 desc "Rebuild lib/uglify.js"
 task :js do
   cd 'vendor/source-map/' do

uglifier.gemspec

@@ -29,6 +29,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rspec", "~> 3.0"
   spec.add_development_dependency "rake", "~> 10.4"
   spec.add_development_dependency "bundler", "~> 1.3"
-  spec.add_development_dependency "rdoc", ">= 3.11"
   spec.add_development_dependency "source_map", ">= 0"
 end