Twenty Fifteen: update editor styles to better account for adaptive images in small screens.

See #31934, props iamtakashi.
Built from https://develop.svn.wordpress.org/trunk@32090


git-svn-id: http://core.svn.wordpress.org/trunk@32069 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-content/themes/twentyfifteen/css/editor-style.css

@@ -486,7 +486,7 @@ body.rtl {
  * 9.0 Media Queries
  */
 
-@media screen and (max-width: 660px) {
+@media screen and (max-width: 740px) {
 	body, img, .wp-caption {
 		max-width: 100%;
 	}

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-beta4-32089';
+$wp_version = '4.2-beta4-32090';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.