Add support for ignoring toml nodes

Closes GH-16.
Closes remarkjs/remark-frontmatter#1.

Author: simov

lib/handlers/index.js

@@ -23,6 +23,7 @@ module.exports = {
   table: require('./table'),
   text: require('./text'),
   thematicBreak: require('./thematic-break'),
+  toml: ignore,
   yaml: ignore,
   definition: ignore,
   footnoteDefinition: ignore

test/index.js

@@ -27,6 +27,7 @@ require('./strong.js');
 require('./table.js');
 require('./text.js');
 require('./thematic-break.js');
+require('./toml.js');
 require('./yaml.js');
 
 require('./handlers-option.js');

test/toml.js

@@ -0,0 +1,15 @@
+'use strict';
+
+var test = require('tape');
+var u = require('unist-builder');
+var to = require('..');
+
+test('TOML', function (t) {
+  t.equal(
+    to(u('toml', 'kilo: "lima"')),
+    null,
+    'should ignore `toml`'
+  );
+
+  t.end();
+});