Hide advanced tab for users for which it has been disabled, as [suggested by jrgmartin](https://github.com/jdevalk/wordpress-seo/issues/93) - props [Jrf](http://profiles.wordpress.org/jrf).
Gitignore...
Removed superfluous gitignore
Reverted .gitignore to original
Merge branch 'master' of git://github.com/jdevalk/wordpress-seo into Issue93-Enhancement-metabox-advanced-tab

Conflicts:
	readme.txt
Merge pull request #94 from jrfnl/Enhancement-metabox-advanced-tab

Hide advanced tab for users for which it has been disabled