First couple of changes to the content of the tour.
Also allows option to position tour differently per page.
Updated tour to describe recently added pages
Added private method WPSEO_Metabox::get_metabox_post()

The post is fetched by checking for $_GET['post_id'] or using the global $post as a fallback. This was repeated multiple times in the class, so a single method makes sense.
Pass post ID to all WPSEO_Meta::get_value calls in WPSEO_Metabox. Fixes #1519
Run more tests in WP 4.0 with PHP 5.5 and 5.4
Replace methodology for removing double whitespace

Fixes issue #1480
Merge branch 'master' of https://github.com/Yoast/wordpress-seo into tour
Hide tour from screens smaller than 1024*768px.
Change default alignment to 'right', but keep option to change this per page.
Skip step about robots.txt and htaccess editing if user doesn't have the right (file)permissions.
Use default alignment.
Remove all rel=author related code
Remove tests for rel=author
Implement JSON+LD sitelinks search functionality
Test case for the functionality
Merge pull request #1551 from Yoast/sitelinks-search

Implement JSON+LD sitelinks search functionality
Merge pull request #1550 from Yoast/remove-rel-author

Remove rel author
Completely remove HTML sitemap functionality, fixes #1549
Missed a meta box to remove
Remove test class for sitemap walker
Merge pull request #1553 from Yoast/remove-rel-author

Missed a meta box to remove