Merge branch 'core-updates'

Makefile.am

build-aux/hydra/gnu-system.scm

doc/guix.texi

gnu-system.am

gnu/packages.scm

gnu/packages/autotools.scm

gnu/packages/base.scm

gnu/packages/bash.scm

gnu/packages/boost.scm

gnu/packages/bootstrap/i686-linux/bash

gnu/packages/bootstrap/i686-linux/mkdir

gnu/packages/bootstrap/i686-linux/tar

gnu/packages/bootstrap/i686-linux/xz

gnu/packages/bootstrap/x86_64-linux/bash

gnu/packages/bootstrap/x86_64-linux/mkdir

gnu/packages/bootstrap/x86_64-linux/tar

gnu/packages/bootstrap/x86_64-linux/xz

gnu/packages/cdrom.scm

gnu/packages/certs.scm

gnu/packages/code.scm