* lib/rubygems:  Update to RubyGems master 66e5c39.  Notable changes:

  Implement gem.deps.rb (Gemfile) .lock support

  Fixed `gem uninstall` for a relative directory in GEM_HOME.

* test/rubygems:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43939 b2dd03c8-39d4-4d8f-98ff-823fe69b080e