REST API: Introduce baby API to the world.

Baby API was born at 2.8KLOC on October 8th at 2:30 UTC. API has lots
of growing to do, so wish it the best of luck.

Thanks to everyone who helped along the way:

Props rmccue, rachelbaker, danielbachhuber, joehoyle, drewapicture,
adamsilverstein, netweb, tlovett1, shelob9, kadamwhite, pento,
westonruter, nikv, tobych, redsweater, alecuf, pollyplummer, hurtige,
bpetty, oso96_2000, ericlewis, wonderboymusic, joshkadis, mordauk,
jdgrimes, johnbillion, jeremyfelt, thiago-negri, jdolan, pkevan,
iseulde, thenbrent, maxcutler, kwight, markoheijnen, phh, natewr,
jjeaton, shprink, mattheu, quasel, jmusal, codebykat, hubdotcom,
tapsboy, QWp6t, pushred, jaredcobb, justinsainton, japh, matrixik,
jorbin, frozzare, codfish, michael-arestad, kellbot, ironpaperweight,
simonlampen, alisspers, eliorivero, davidbhayes, JohnDittmar, dimadin,
traversal, cmmarslender, Toddses, kokarn, welcher, and ericpedia.

Fixes #33982.


git-svn-id: https://develop.svn.wordpress.org/trunk@34928 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/rest-api.php

@@ -0,0 +1,26 @@
+<?php
+/**
+ * REST API functions.
+ *
+ * @package WordPress
+ * @subpackage REST_API
+ */
+
+/**
+ * Version number for our API.
+ *
+ * @var string
+ */
+define( 'REST_API_VERSION', '2.0' );
+
+/** WP_REST_Server class */
+require_once( ABSPATH . WPINC . '/rest-api/lib/class-wp-rest-server.php' );
+
+/** WP_REST_Response class */
+require_once( ABSPATH . WPINC . '/rest-api/lib/class-wp-rest-response.php' );
+
+/** WP_REST_Request class */
+require_once( ABSPATH . WPINC . '/rest-api/lib/class-wp-rest-request.php' );
+
+/** REST functions */
+require_once( ABSPATH . WPINC . '/rest-api/rest-functions.php' );