More optimization improvements to snippet preview, including:
- more caching of variables;
- delays on the replace AJAX call;
- namespacing of most of the javascript functions;
- improvement to the regex in the JS;
- remove unused functions in the JS.
Merge branch 'master' of https://github.com/Yoast/wordpress-seo
Added an action to allow adding content to the Post Type tab on the meta admin page.
Merge branch 'master' of github.com:Yoast/wordpress-seo
Change subset name to WordPress-Extra instead of WordPressExtra, should fix PHP CS
Attempt at fixing Travis build
Clone over https instead of ssh
Would be nice if the WPCS documentation got ONE thing right.
Now run phpcs from the right path.
Added 'wpseo_option_titles_variable_array_key_patterns' to allow alteration of the titles variable array key patterns.
Fix an issue with sitemap transient caching for plugins not using paginated sitemaps (like news seo).
Replaced time() with a string representation of current time as first parameter in a new DateTime object in the sitemap.
Remove post connector from banners and extensions admin.
Merge branch 'master' of git://github.com/Yoast/wordpress-seo into PHPCS

Conflicts:
	.travis.yml
	codesniffer.xml
Some more code style clean up