* lib/rubygems: Update to RubyGems to 2.0.8. [ruby-core:57155]
  [Backport #8900]
  the patch is provided by drbrain (Eric Hodel).
  this update contains a security fix for CVE-2013-4287.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@42937 b2dd03c8-39d4-4d8f-98ff-823fe69b080e