Add MD033 with tests, rename test file.

lib/markdownlint.js

@@ -1,7 +1,7 @@
 "use strict";
 
 var fs = require("fs");
-var md = require("markdown-it")();
+var md = require("markdown-it")({ "html": true });
 var rules = require("./rules");
 var shared = require("./shared");
 

lib/rules.js

@@ -607,5 +607,17 @@ module.exports = [
         prevLine = line;
       });
     }
+  },
+
+  {
+    "name": "MD033",
+    "desc": "Inline HTML",
+    "tags": [ "html" ],
+    "func": function MD033(params, errors) {
+      filterTokens(params.tokens, "html_inline", "html_block")
+        .forEach(function forToken(token) {
+          errors.push(token.lineNumber);
+        });
+    }
   }
 ];