add Pod-To-HTML to gem

Author: kivikakk

github-markup.gemspec

@@ -12,6 +12,7 @@ Gem::Specification.new do |s|
   s.license       = "MIT"
 
   s.files         = `git ls-files`.split($\)
+  s.files        += Dir['vendor/Pod-To-HTML/**/*']
   s.executables   = s.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
   s.test_files    = s.files.grep(%r{^(test|spec|features)/})
   s.require_paths = %w[lib]