Add support for <blockquote>

Closes GH-15.

Author: sethvincent

handlers/blockquote.js

@@ -0,0 +1,9 @@
+'use strict';
+
+module.exports = blockquote;
+
+var all = require('../all');
+
+function blockquote(h, node) {
+  return h(node, 'blockquote', all(h, node));
+}

handlers/index.js

@@ -19,6 +19,7 @@ exports.br = require('./break');
 exports.p = require('./paragraph');
 exports.hr = require('./thematic-break');
 exports.pre = require('./code');
+exports.blockquote = require('./blockquote');
 
 exports.h1 = exports.h2 = exports.h3 =
   exports.h4 = exports.h5 = exports.h6 = require('./heading');

tests/fixtures/blockquote/index.html

@@ -0,0 +1,5 @@
+<blockquote><h1>This is a header in a blockquote.</h1></blockquote>
+
+<p>paragraph</p>
+
+<blockquote><p>This is a blockquote.</p></blockquote>

tests/fixtures/blockquote/index.json

@@ -0,0 +1,3 @@
+{
+  "fragment": true
+}

tests/fixtures/blockquote/index.md

@@ -0,0 +1,5 @@
+> # This is a header in a blockquote.
+
+paragraph
+
+> This is a blockquote.