REST API: Make JS Client store schema in session storage.

Props adamsilverstein.
Fixes #38895.
Built from https://develop.svn.wordpress.org/trunk@39344


git-svn-id: http://core.svn.wordpress.org/trunk@39284 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/wp-api.js

@@ -1017,7 +1017,7 @@
 					success: function( newSchemaModel ) {
 
 						// Store a copy of the schema model in the session cache if available.
-						if ( ! _.isUndefined( sessionStorage ) && wpApiSettings.cacheSchema ) {
+						if ( ! _.isUndefined( sessionStorage ) && ( _.isUndefined( wpApiSettings.cacheSchema ) || wpApiSettings.cacheSchema ) ) {
 							try {
 								sessionStorage.setItem( 'wp-api-schema-model' + model.get( 'apiRoot' ) + model.get( 'versionString' ), JSON.stringify( newSchemaModel ) );
 							} catch ( error ) {

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-beta4-39343';
+$wp_version = '4.7-beta4-39344';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.