cherry picking https://github.com/rubygems/rubygems/commit/f9232680
  [Bug #12066]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@54337 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

* test/rubygems:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48729 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

* test/rubygems:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47748 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  Complete history at:
  https://github.com/rubygems/rubygems/blob/master/History.txt#L3-L216
* test/rubygems:  ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47582 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

	  CI.
	* test/rubygems:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44799 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

	* lib/rubygems/basic_specification.rb (class Gem):
	* lib/rubygems/commands/contents_command.rb (prefix or only the files that are requir):
	* lib/rubygems/commands/install_command.rb (to write the specification by hand):
	* lib/rubygems/commands/setup_command.rb (class Gem):
	* lib/rubygems/commands/setup_command.rb (TEXT):
	* lib/rubygems/compatibility.rb (module Gem):
	* lib/rubygems/defaults.rb (module Gem):
	* lib/rubygems/deprecate.rb (module Gem):
	* lib/rubygems/installer.rb (class Gem):
	* lib/rubygems/platform.rb (class Gem):
	* lib/rubygems/rdoc.rb (class Gem):
	* lib/rubygems/request_set/lockfile.rb (class Gem):
	* lib/rubygems/resolver/installer_set.rb (class Gem):
	* lib/rubygems/resolver.rb (class Gem):
	* lib/rubygems/specification.rb (class Gem):
	* lib/rubygems/test_case.rb (class Gem):
	* lib/rubygems/test_case.rb (Also):
	* lib/rubygems/uninstaller.rb (class Gem):
	* lib/rubygems.rb (module Gem):
	* test/rubygems/test_gem.rb (class TestGem):
	* test/rubygems/test_gem_commands_contents_command.rb (lib):
	* test/rubygems/test_gem_commands_environment_command.rb (class TestGemCommandsEnvironmentCommand):
	* test/rubygems/test_gem_commands_install_command.rb (ERROR):
	* test/rubygems/test_gem_commands_update_command.rb (class TestGemCommandsUpdateCommand):
	* test/rubygems/test_gem_dependency_installer.rb (class TestGemDependencyInstaller):
	* test/rubygems/test_gem_installer.rb (load Gem):
	* test/rubygems/test_gem_installer.rb (gem):
	* test/rubygems/test_gem_request_set_lockfile.rb (GEM):
	* test/rubygems/test_gem_request_set_lockfile.rb (DEPENDENCIES):
	* test/rubygems/test_gem_specification.rb (dependencies):
	* test/rubygems/test_gem_specification.rb (duplicate dependency on b):
	* test/rubygems/test_gem_uninstaller.rb (class TestGemUninstaller):


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44515 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  * Improved speed of `gem install --ignore-dependencies`.

  * Open read-write for exclusive flock.  [ruby-trunk - Bug #9257]

  * Remove specification before install to prevent infinite loop.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44286 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  Fixed installation and activation of git: and path: gems via
  Gem.use_gemdeps

  Improved documentation coverage

* test/rubygems:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43845 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  Only attempt to build extensions for newly-installed gems.  This
  prevents compilation attempts at gem activation time for gems that
  already have extensions built.

  Fix crash in the dependency resolver for dependencies that cannot be
  resolved.

* test/rubygems:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43368 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  Fixed documentation generation when sdoc and json are installed as
  gems.

  Added some missing documentation.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43317 b2dd03c8-39d4-4d8f-98ff-823fe69b080e