Merge README.md

README.md

@@ -63,3 +63,9 @@ It's an interpreter, not a compiler. It keeps a tree of commands and expressions
 - [Ways to load code](https://practicingruby.com/articles/ways-to-load-code)
 - [Include vs Extend in Ruby](http://www.railstips.org/blog/archives/2009/05/15/include-vs-extend-in-ruby/)
 - [Ruby Require VS Load VS Include VS Extend](http://ionrails.com/2009/09/19/ruby_require-vs-load-vs-include-vs-extend/)
+- [Tapping method chains with Ruby 1.9](http://www.infoq.com/news/2008/02/tap-method-ruby19)
+- [Eavesdropping on Expressions (more tap)](http://moonbase.rydia.net/mental/blog/programming/eavesdropping-on-expressions)
+- [Chaining methods using tap](http://siddharth-ravichandran.com/2010/11/30/chaining-methods-using-tap-method/)
+- [Passing functions in Ruby: harder than it looks](http://blog.jessitron.com/2013/03/passing-functions-in-ruby-harder-than.html)
+- [Ruby Functional Programming](https://code.google.com/p/tokland/wiki/RubyFunctionalProgramming)
+- [Minitest Quick Reference](http://mattsears.com/articles/2011/12/10/minitest-quick-reference)