build: ruby: Rewrite build system to use gem archives.

Co-Authored-By: Pjotr Prins <pjotr.public01@thebird.nl>

* guix/build-system/ruby.scm (lower): Remove git dependency.
  (rubygems-uri): New procedure.
* guix/build/ruby-build-system (gitify): Delete.
  (unpack): Use 'gem unpack' utility.
  (check): Add docstring.
  (build): Repack modified gem.
  (install): Rebuild unpacked gem and install it.
  (%standard-phases): Remove gitify and build phases.
* gnu/packages/ruby.scm (ruby-hoe, ruby-rake-compiler, ruby-i18n,
  ruby-rspec-support, ruby-rspec-core, ruby-diff-lcs-for-rspec,
  ruby-rspec-expectations, ruby-rspec-mocks, ruby-rspec, bundler,
  ruby-useragent, ruby-bacon, ruby-arel, ruby-connection-pool,
  ruby-net-http-persistent, ruby-minitest, ruby-minitest-sprint,
  ruby-minitest-bacon, ruby-daemons, ruby-git, ruby-slop,
  ruby-multipart-post): Convert to new build system.
* doc/guix.texi (ruby-build-system): Document the gem archive requirement.

Merge branch 'master' into core-updates

gnu packages: Clean up synopses and descriptions.

* gnu/packages/admin.scm, gnu/packages/algebra.scm, gnu/packages/audio.scm,
  gnu/packages/backup.scm, gnu/packages/base.scm, gnu/packages/bittorrent.scm,
  gnu/packages/code.scm, gnu/packages/compression.scm,
  gnu/packages/databases.scm, gnu/packages/enchant.scm,
  gnu/packages/firmware.scm, gnu/packages/fonts.scm,
  gnu/packages/freedesktop.scm, gnu/packages/games.scm, gnu/packages/gd.scm,
  gnu/packages/gl.scm, gnu/packages/gnome.scm, gnu/packages/gsasl.scm,
  gnu/packages/gstreamer.scm, gnu/packages/gtk.scm, gnu/packages/guile.scm,
  gnu/packages/haskell.scm, gnu/packages/language.scm,
  gnu/packages/lesstif.scm, gnu/packages/libreoffice.scm,
  gnu/packages/linux.scm, gnu/packages/llvm.scm, gnu/packages/maths.scm,
  gnu/packages/mcrypt.scm, gnu/packages/mit-krb5.scm, gnu/packages/mp3.scm,
  gnu/packages/ncdu.scm, gnu/packages/networking.scm, gnu/packages/ntp.scm,
  gnu/packages/ocaml.scm, gnu/packages/openbox.scm, gnu/packages/pdf.scm,
  gnu/packages/perl.scm, gnu/packages/pretty-print.scm,
  gnu/packages/pulseaudio.scm, gnu/packages/python.scm,
  gnu/packages/rdesktop.scm, gnu/packages/rdf.scm, gnu/packages/ruby.scm,
  gnu/packages/slang.scm, gnu/packages/slim.scm, gnu/packages/telephony.scm,
  gnu/packages/tls.scm, gnu/packages/tmux.scm, gnu/packages/tre.scm,
  gnu/packages/unrtf.scm, gnu/packages/version-control.scm,
  gnu/packages/vpn.scm, gnu/packages/web.scm, gnu/packages/wget.scm,
  gnu/packages/xdisorg.scm, gnu/packages/xfce.scm, gnu/packages/xiph.scm:
  Fix typos.  Trim long lines.  Add missing periods in the end of sentences.
  Use double spaces between sentences.  Remove trailing whitespaces.

gnu: ruby: Remove custom 'rake gem' build phase from all gems.

* gnu/packages/ruby.scm (ruby-hoe, ruby-rake-compiler,
  ruby-net-http-persistent, ruby-minitest, ruby-minitest-sprint,
  ruby-minitest-bacon): Remove custom 'rake gem' build phase that is now
  handled automatically by the Ruby build system.

gnu: Move content of openssl module into tls module.

* gnu/packages/openssl.scm (openssl, perl-net-ssleay): Move to...
* gnu/packages/tls.scm: ...here.
* gnu/packages/openssl.scm: Delete file.
* gnu-system.am (GNU_SYSTEM_MODULES): Unregister deleted file.
* gnu/packages/{admin.scm, bittorrent.scm, certs.scm, ci.scm,
  cyrus-sasl.scm, databases.scm, dns.scm, ebook.scm, enlightenment.scm,
  gnunet.scm, libreoffice.scm, links.scm, mail.scm, messaging.scm,
  networking.scm, ntp.scm, openldap.scm, package-management.scm, pdf.scm,
  python.scm, qt.scm, rdesktop.scm, rdf.scm, ruby.scm, ssh.scm,
  synergy.scm, tor.scm, version-control.scm, video.scm, vpn.scm,
  w3m.scm, web.scm, weechat.scm, xiph.scm}: Adapt module import.

gnu: Add ruby-rake-compiler.

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

Merge branch 'master' into core-updates

gnu: Add ruby 2.1.6

* gnu/packages/ruby.scm (ruby-2.1): New variable.

Merge branch 'master' into core-updates

gnu: Add ruby-multipart-post.

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

gnu: Add ruby-slop.

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

gnu: Add ruby-git.

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

gnu: Add ruby-minitest-bacon.

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

gnu: Add ruby-minitest-sprint.

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

gnu: Add ruby-minitest.

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

gnu: Add ruby-daemons.

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

gnu: Add ruby-net-http-persistent.

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

gnu: Add ruby-connection-pool.

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

gnu: Add ruby-arel.

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

gnu: Add ruby-bacon.

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