Use Aliki as default theme

Author: st0012

Rakefile

@@ -29,6 +29,7 @@ task rdoc: :generate
 RDoc::Task.new do |doc|
   # RDoc task defaults to /html and overrides the op_dir option in .rdoc_options
   doc.rdoc_dir = "_site" # for GitHub Pages
+  doc.template = "aliki"
 end
 
 task "coverage" do