Coding Standards: Upgrade WPCS to 1.0.0

WPCS 1.0.0 includes a bunch of new auto-fixers, which drops the number of coding standards issues across WordPress significantly. Prior to running the auto-fixers, there were 15,312 issues detected. With this commit, we now drop to 4,769 issues.

This change includes three notable additions:
- Multiline function calls must now put each parameter on a new line.
- Auto-formatting files is now part of the `grunt precommit` script. 
- Auto-fixable coding standards issues will now cause Travis failures.

Fixes #44600.



git-svn-id: https://develop.svn.wordpress.org/trunk@43571 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/feed-rss.php

@@ -35,7 +35,7 @@ echo '<?xml version="1.0" encoding="' . get_option( 'blog_charset' ) . '"?' . '>
 <?php
 while ( have_posts() ) :
 	the_post();
-?>
+	?>
 	<item>
 		<title><?php the_title_rss(); ?></title>
 		<description><![CDATA[<?php the_excerpt_rss(); ?>]]></description>