gnu: Add ruby-gem-hadar.

* gnu/packages/ruby.scm (ruby-gem-hadar): New variable.

gnu: Add ruby-minitest-4.

* gnu/packages/ruby.scm (ruby-minitest-4): New variable.

gnu: Add ruby-tins.

* gnu/packages/ruby.scm (ruby-tins): New variable.

gnu: Add ruby-sdoc.

* gnu/packages/ruby.scm (ruby-sdoc): New variable.

gnu: Add ruby-pry-editline.

* gnu/packages/ruby.scm (ruby-pry-editline): New variable.

gnu: Add ruby-ci-reporter.

* gnu/packages/ruby.scm (ruby-ci-reporter): New variable.

gnu: Add ruby-atoulme-saikuro.

* gnu/packages/ruby.scm (ruby-atoulme-saikuro): New variable.

gnu: Add ruby-simplecov.

* gnu/packages/ruby.scm (ruby-simplecov): New variable.

gnu: ruby-simplecov-html: Fix hash and disable tests.

* gnu/packages/ruby.scm (ruby-simplecov-html)[source]: Replace incorrect
  hash.
[arguments]: Disable tests.

gnu: Add ruby-net-ssh.

* gnu/packages/ruby.scm (ruby-net-ssh): New variable.

gnu: Add ruby-mocha.

* gnu/packages/ruby.scm (ruby-mocha): New variable.

gnu: Add ruby-redcarpet.

* gnu/packages/ruby.scm (ruby-redcarpet): New variable.

gnu: Add ruby-introspection.

* gnu/packages/ruby.scm (ruby-introspection): New variable.

gnu: Add ruby-instantiator.

* gnu/packages/ruby.scm (ruby-instantiator): New variable.

gnu: Add ruby-blankslate.

* gnu/packages/ruby.scm (ruby-blankslate): New variable.

gnu: Add ruby-metaclass.

* gnu/packages/ruby.scm (ruby-metaclass): New variable.

gnu: Add ruby-test-unit.

* gnu/packages/ruby.scm (ruby-test-unit): New variable.

gnu: Add ruby-packnga.

* gnu/packages/ruby.scm (ruby-packnga): New variable.

gnu: Add ruby-gettext.

* gnu/packages/ruby.scm (ruby-gettext): New variable.

gnu: Add ruby-text.

* gnu/packages/ruby.scm (ruby-text): New variable.