Demonstrate how multiple versions of the same gems with gem plugins not only get added to the load path but take precedence over the more recent versions

gistfile1

john-mbp:projects john$ irb -f
irb(main):001:0> require 'pp'
=> true
irb(main):002:0> pp $:
["/Library/Ruby/Site/1.8",
 "/Library/Ruby/Site/1.8/powerpc-darwin9.0",
 "/Library/Ruby/Site/1.8/universal-darwin9.0",
 "/Library/Ruby/Site",
 "/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8",
 "/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/powerpc-darwin9.0",
 "/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin9.0",
 "."]
=> nil
irb(main):003:0> require 'rubygems'
=> true
irb(main):004:0> pp $:
["/Library/Ruby/Gems/1.8/gems/gemcutter-0.1.4/lib",
 "/Library/Ruby/Gems/1.8/gems/gemcutter-0.1.6/lib",
 "/Library/Ruby/Gems/1.8/gems/gemcutter-0.1.8/lib",
 "/Library/Ruby/Gems/1.8/gems/gemcutter-0.2.0/lib",
 "/Library/Ruby/Gems/1.8/gems/gemcutter-0.2.1/lib",
 "/Library/Ruby/Gems/1.8/gems/gemcutter-0.3.0/lib",
 "/Library/Ruby/Gems/1.8/gems/bundler-0.8.1/bin",
 "/Library/Ruby/Gems/1.8/gems/bundler-0.8.1/lib",
 "/Library/Ruby/Gems/1.8/gems/open_gem-1.3.1/bin",
 "/Library/Ruby/Gems/1.8/gems/open_gem-1.3.1/lib",
 "/Library/Ruby/Site/1.8",
 "/Library/Ruby/Site/1.8/powerpc-darwin9.0",
 "/Library/Ruby/Site/1.8/universal-darwin9.0",
 "/Library/Ruby/Site",
 "/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8",
 "/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/powerpc-darwin9.0",
 "/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin9.0",
 "."]
=> nil