Merge branch 'core-updates'

Conflicts:
	gnu/packages/bootstrap.scm

packages: Add 'file-type' field to 'search-path-specification'.

Fixes <http://bugs.gnu.org/18033>.

* guix/packages.scm (<search-path-specification>): Rename 'directories'
  field to 'files'.  Add 'file-type'.
  (search-path-specification->sexp): Honor 'file-type'.
* gnu/packages/autotools.scm, gnu/packages/bootstrap.scm,
  gnu/packages/cross-base.scm, gnu/packages/games.scm,
  gnu/packages/gcc.scm, gnu/packages/glib.scm,
  gnu/packages/guile.scm, gnu/packages/man.scm,
  gnu/packages/perl.scm, gnu/packages/pkg-config.scm,
  gnu/packages/python.scm, gnu/packages/ruby.scm,
  gnu/packages/xfce.scm: Change 'directories' to 'files'.
* tests/packages.scm ("search paths"): Change 'directories' field to
  'files'.
* guix/scripts/environment.scm (for-each-search-path): Likewise.

gnu: ruby: Update to 2.1.5.

* gnu/packages/ruby.scm (ruby): Update to version 2.1.5.

gnu: ruby: Update to 2.1.4.

* gnu/packages/ruby.scm: Update.  Remove the now redundant readline patch.

gnu: ruby: Miscellaneous improvements to package definition.

* gnu/packages/ruby.scm (ruby): Compute major+minor version string for the
  source URI.  Switch to the .bz2 tarball and update the hash accordingly.
  Remove 'autoconf' from the inputs.  Change 'native-search-paths' to the
  directory that is actually created by the build.  Remove the package name
  from the synopsis.
  (ruby-1.8): Compute major+minor version string for the source URI, and avoid
  the use of 'name' in the URI computation.  Remove 'name' field, since it is
  inherited and no longer needed.

gnu: Add ruby 1.8.7.

* gnu/packages/ruby.scm (ruby-1.8): New variable.

gnu: Add ruby-i18n.

* gnu/packages/ruby.scm (ruby-i18n): New variable.

gnu: Add ruby.

Co-authored-by: David Thompson <davet@gnu.org>

* gnu/packages/ruby.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* guix/licenses.scm (ruby): New variable.