Add core to metadata.

Key has to be the same as it was in bind, so that the script can tell
it's the same library.

meta/libraries.json

@@ -50,5 +50,23 @@
         "maintainers": [
             "Joseph Gauterin <joseph.gauterin -at- googlemail.com>"
         ]
+    },
+    {
+        "key": "bind/ref",
+        "name": "Ref",
+        "authors": [
+            "Jaako Järvi",
+            "Peter Dimov",
+            "Doug Gregor",
+            "Dave Abrahams"
+        ],
+        "description": "A utility library for passing references to generic functions.",
+        "documentation": "ref.html",
+        "std": [
+            "tr1"
+        ],
+        "category": [
+            "Function-objects"
+        ]
     }
 ]