branch master updated (d65854b -> ceb3952)

[Mathieu Othacehe]

mothacehe pushed a change to branch master
in repository guix.

      from  d65854b   gnu: python2-pyicu: Disable failing test.
       new  5a72ddf   scripts: system: Add --expression option.
       new  ceb3952   system: Add BeagleBone Black installer.

The 2 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "adds" were already present in the repository and have only
been added to this reference.


Summary of changes:
 doc/guix.texi             |  8 ++++++++
 gnu/bootloader/u-boot.scm | 25 ++++++++++++++++++++++++-
 gnu/system/install.scm    | 29 +++++++++++++++++++++++++++--
 guix/scripts/system.scm   | 28 ++++++++++++++++++++++------
 4 files changed, 81 insertions(+), 9 deletions(-)