Replace Lexer with Pygments::Lexer

Rakefile

@@ -1,4 +1,3 @@
-require 'rake/clean'
 require 'rake/testtask'
 
 task :default => :test
@@ -6,16 +5,3 @@ task :default => :test
 Rake::TestTask.new do |t|
   t.warning = true
 end
-
-CLOBBER.include 'lib/linguist/lexers.yml'
-
-file 'lib/linguist/lexers.yml' do |f|
-  # GitHub vendored pygments path
-  #   vendor/python/pygments
-  path = File.expand_path('../../../python/pygments', __FILE__)
-  ENV['PYTHONPATH'] = path if File.directory?(path)
-
-  sh "python ./bin/pygments-lexers > #{f.name}"
-end
-
-task :lexers => 'lib/linguist/lexers.yml'