Revert 7ff6de20561ba20b0a6876c66e1ddd3271a10084 as we don't need it
anymore; bug has been fixed plus we don't care about Ruby 1.8.7.
Put back "gem update --system"
Merge pull request #2445 from juliandunn/remove-travis-187-workaround

Revert rubygems 2.2.0 with bundler 1.5 with Ruby 1.8.7 fix