move draft4-specific file to dedicated dir for this draft, and add $s…

…chema

..otherwise, draft-specific test suites won't know to skip adding this file.
But if they do try to load this file (because they understand draft4), they
need to know what metaschema to use, so we also add a "$schema" keyword.

remotes/locationIndependentIdentifierDraft4.json → remotes/draft4/locationIndependentIdentifierDraft4.json

@@ -1,4 +1,5 @@
 {
+    "$schema": "http://json-schema.org/draft-04/schema#",
     "definitions": {
         "refToInteger": {
             "$ref": "#foo"