gnu: Add ruby-redcloth.

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

gnu: Add ruby-sanitize.

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

gnu: Add ruby-pygmentize.

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

gnu: Add ruby-cutest.

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

gnu: Add ruby-clap.

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

gnu: Add ruby-nokogumbo.

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

gnu: Add ruby-crass.

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

gnu: Add ruby-nokogiri-diff.

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

gnu: Add ruby-tdiff.

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

gnu: Add ruby-unf-ext.

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

gnu: Add ruby-netrc.

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

gnu: Add ruby-guard.

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

gnu: ruby-listen: Add rb-fsevent to inputs.

* gnu/packages/ruby.scm (ruby-listen)[propagated-inputs]: Add
  "ruby-rb-fsevent".

gnu: Add ruby-rb-fsevent.

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

gnu: Add ruby-saikuro-treemap.

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

gnu: Add ruby-json-pure.

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

gnu: Add ruby-utils.

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

gnu: Add ruby-pstree.

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

gnu: Add ruby-term-ansicolor.

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

gnu: Add ruby-minitest-tu-shim.

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