Move 'functional' headers and update paths

meta/libraries.json

@@ -2,14 +2,14 @@
     {
         "key": "functional/hash",
         "boost-version": "1.33.0",
-        "name": "Functional/Hash",
+        "name": "Container Hash",
         "authors": [
             "Daniel James"
         ],
         "maintainers": [
             "Daniel James <dnljms -at- gmail.com>"
         ],
-        "description": "A TR1 hash function object that can be extended to hash user defined types.",
+        "description": "An STL-compatible hash function object that can be extended to hash user defined types.",
         "std": [
             "tr1"
         ],
@@ -17,4 +17,4 @@
             "Function-objects"
         ]
     }
-]
+]