Re-ordering Ruby resources with official resources at top

free-programming-books.md

@@ -1556,7 +1556,11 @@ See also [TeX](#tex)
 
 
 ### Ruby
+* [Ruby in Twenty Minutes](https://www.ruby-lang.org/en/documentation/quickstart/)
+* [Programming Ruby](http://www.ruby-doc.org/docs/ProgrammingRuby/)
+* [Ruby Learning](http://rubylearning.com/)
 * [A community-driven Ruby style guide](https://github.com/bbatsov/ruby-style-guide)
+* [Ruby User's Guide](http://www.rubyist.net/~slagell/ruby/)
 * [CodeCademy Ruby](http://www.codecademy.com/tracks/ruby)
 * [Developing Games With Ruby](https://leanpub.com/developing-games-with-ruby/read)
 * [I Love Ruby](http://goo.gl/1qrMUN)
@@ -1565,15 +1569,11 @@ See also [TeX](#tex)
 * [Learn to Program, by Chris Pine](http://pine.fm/LearnToProgram/)
 * [Mr. Neighborly's Humble Little Ruby Book](http://www.humblelittlerubybook.com/)
 * [Practicing Ruby](https://github.com/elm-city-craftworks/practicing-ruby-manuscripts)
-* [Programming Ruby](http://www.ruby-doc.org/docs/ProgrammingRuby/)
 * [Read Ruby](http://readruby.io/)
 * [Ruby Essentials](http://www.techotopia.com/index.php/Ruby_Essentials)
 * [Ruby Hacking Guide](http://ruby-hacking-guide.github.io/)
-* [Ruby in Twenty Minutes](https://www.ruby-lang.org/en/documentation/quickstart/)
 * [Ruby Koans](http://www.rubykoans.com/)
-* [Ruby Learning](http://rubylearning.com/)
 * [Ruby Programming](http://www.linuxtopia.org/online_books/programming_books/ruby_tutorial/)
-* [Ruby User's Guide](http://www.rubyist.net/~slagell/ruby/)
 * [The Bastards Book of Ruby](http://ruby.bastardsbook.com/)
 * [The Little Book Of Ruby](http://www.sapphiresteel.com/ruby-programming/The-Little-Book-Of-Ruby.html)
 * [The Unofficial Ruby Usage Guide (at Google)](http://www.caliban.org/ruby/rubyguide.shtml) - Ian Macdonald