jQuery tabs code not checking

So the tabs code is always running even when the wpseo metabox isn't
shown. This just checks to see if the tabs screen is displayed before
checking the hash or default. If other metabox use tabs this won't mess
with them.
Fixed table name regression
Fixes hash error after being redirected from FB API + some code improvements to wp-seo-admin.js
Use jQuery instead of $
#521 If the publish date of the post is later than the modified, make that the "last_modified" in the sitemap for googles eyes.
Merge git://github.com/jdevalk/wordpress-seo into error-object-as-term

Conflicts:
	readme.txt
Merge git://github.com/jdevalk/wordpress-seo into shortcode-in-ajax

Conflicts:
	readme.txt
Updated readme
Better fix description
Merge git://github.com/jdevalk/wordpress-seo into empty-post-id-auth-check

Conflicts:
	readme.txt
Merge git://github.com/jdevalk/wordpress-seo into empty-post-id-auth-check

Conflicts:
	readme.txt
Merge git://github.com/jdevalk/wordpress-seo into error-object-as-term

Conflicts:
	readme.txt
Merge git://github.com/jdevalk/wordpress-seo into shortcode-in-ajax

Conflicts:
	readme.txt
Merge git://github.com/jdevalk/wordpress-seo into empty-post-id-auth-check

Conflicts:
	readme.txt
Merge git://github.com/jdevalk/wordpress-seo into error-object-as-term

Conflicts:
	readme.txt
Merge git://github.com/jdevalk/wordpress-seo into shortcode-in-ajax

Conflicts:
	readme.txt
Fixed changelog bug and added contributor
Removed screen_icon() calls
Readme update
Fix double robots header, WP native settings will (and should) be respected