added wpseo_frontend tests, better tests asserting output for wpseo_opengraph
replace wpseo variables for social descriptions
Moving wpseo_replace_vars above boolean check
Merge branch 'pr/982'
Added FAQ link plugin links.
Version bump top 1.5.2.6
Merge branch 'master' of git://github.com/Yoast/wordpress-seo into Remove-breadcrumb-enable