New features since 1.2.0:
* RubyGems doesn't print LOCAL/REMOTE titles for `gem query` and friends if
stdout is not a TTY, except with --both.
* Added Gem.find_files, allows a gem to discover features provided by other
gems.
* Added pre/post (un)install hooks for packagers of RubyGems. (Not for gems
themselves).
* RubyGems now installs gems into ~/.gem if GEM_HOME is not writable. Use
--no-user-install command-line switch to disable this behavior.
* Fetching specs for update now uses If-Modified-Since requests.
* RubyGems now updates the ri cache when the rdoc gem is installed and
documentation is generated.
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