Update packages/ Add org-ref

elpa/ess-20180611.502/dir

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+This is the file .../info/dir, which contains the
+topmost node of the Info hierarchy, called (dir)Top.
+The first time you invoke Info you start off looking at this node.
+
+File: dir,	Node: Top,	This is the top of the INFO tree
+
+  This (the Directory node) gives a menu of major topics.
+  Typing "q" exits, "?" lists all Info commands, "d" returns here,
+  "h" gives a primer for first-timers,
+  "mEmacs<Return>" visits the Emacs manual, etc.
+
+  In Emacs, you can click mouse button 2 on a menu item or cross reference
+  to select it.
+
+* Menu:
+
+Emacs
+* ESS: (ess).                   Emacs Speaks Statistics (R/S/S+, SAS, 
+                                  BUGS/JAGS and Stata).