--no-ri --no-rdoc is deprecated, use --no-document

Reference: http://guides.rubygems.org/command-reference/
Removed deprecated bulk_threshold-instance method

http://www.rubydoc.info/github/rubygems/rubygems/Gem/ConfigFile#bulk_threshold-instance_method
Use https for rubygems.org
Merge pull request #1 from jeffwidman/master

--no-ri --no-rdoc is deprecated, use --no-document