Added enhancement to allow for specifying variable name to restore.

Contributes to gh-3167

IPython/extensions/storemagic.py

@@ -100,6 +100,8 b' class StoreMagics(Magics):'
         * ``%store -z``       - Remove all variables from storage
         * ``%store -r``       - Refresh all variables from store (delete
                                 current vals)
+        * ``%store -r spam``  - Refresh specified variable from store (delete
+                                current val)
         * ``%store foo >a.txt``  - Store value of foo to new file a.txt
         * ``%store foo >>a.txt`` - Append value of foo to file a.txt
 
@@ -133,9 +135,17 b' class StoreMagics(Magics):'
                 del db[k]
 
         elif 'r' in opts:
+            if args:
+                try:
+                    obj = db['autorestore/' + args[0]]
+                except KeyError:
+                    print "Unable to restore variable '%s', (use %%store -d to forget!)" % args[0]
+                    print "The error was:", sys.exc_info()[0]
+                else:
+                    ip.user_ns[args[0]] = obj
+            else:
             refresh_variables(ip)
 
-
         # run without arguments -> list variables & values
         elif not args:
             vars = db.keys('autorestore/*')