master updated (21c5805 -> 23e6c36)

[Lars Ingebrigtsen]

larsi pushed a change to branch master.

      from  21c5805   Remove reference to Emacs Lisp List from FAQ
       new  82893e9   Fix ert ability to peek inside structures when comparing 
unequal values
       new  23e6c36   Implement a cache for all types of gravatars


Summary of changes:
 lisp/emacs-lisp/ert.el |  9 +++++++-
 lisp/image/gravatar.el | 57 +++++++++++++++++++++++++++++++++++++-------------
 2 files changed, 50 insertions(+), 16 deletions(-)