refactor: rename $data.js and $data.json without $, closes #526

lib/ajv.js

@@ -7,7 +7,7 @@ var compileSchema = require('./compile')
   , stableStringify = require('fast-json-stable-stringify')
   , formats = require('./compile/formats')
   , rules = require('./compile/rules')
-  , $dataMetaSchema = require('./$data')
+  , $dataMetaSchema = require('./data')
   , patternGroups = require('./patternGroups')
   , util = require('./compile/util');
 
@@ -433,7 +433,7 @@ function addFormat(name, format) {
 function addDraft6MetaSchema(self) {
   var $dataSchema;
   if (self._opts.$data) {
-    $dataSchema = require('./refs/$data.json');
+    $dataSchema = require('./refs/data.json');
     self.addMetaSchema($dataSchema, $dataSchema.$id, true);
   }
   if (self._opts.meta === false) return;

lib/data.js

@@ -38,7 +38,7 @@ module.exports = function (metaSchema, keywordsJsonPointers) {
         keywords[key] = {
           anyOf: [
             schema,
-            { $ref: 'https://raw.githubusercontent.com/epoberezkin/ajv/master/lib/refs/$data.json#' }
+            { $ref: 'https://raw.githubusercontent.com/epoberezkin/ajv/master/lib/refs/data.json#' }
           ]
         };
       }

lib/keyword.js

@@ -50,7 +50,7 @@ function addKeyword(keyword, definition) {
         metaSchema = {
           anyOf: [
             metaSchema,
-            { '$ref': 'https://raw.githubusercontent.com/epoberezkin/ajv/master/lib/refs/$data.json#' }
+            { '$ref': 'https://raw.githubusercontent.com/epoberezkin/ajv/master/lib/refs/data.json#' }
           ]
         };
       }

lib/refs/data.json

@@ -1,6 +1,6 @@
 {
     "$schema": "http://json-schema.org/draft-07/schema#",
-    "$id": "https://raw.githubusercontent.com/epoberezkin/ajv/master/lib/refs/$data.json#",
+    "$id": "https://raw.githubusercontent.com/epoberezkin/ajv/master/lib/refs/data.json#",
     "description": "Meta-schema for $data reference (JSON-schema extension proposal)",
     "type": "object",
     "required": [ "$data" ],