Removed deprecated `has_rdoc` gemspec option
This was deprecated for removal in RubyGems 1.8
…ing them for deletion Also replaced brittle exception handling with a check against #destroyed? as to avoid "can't modify frozen hash" error.
…be fixed in 3.0.4).
…s ObjectID update gemspec don't send content-type headers in 304
…ction to be passed (also lazily evaluated).