Auto-deactivate plugin if SPL extension not available (prevent white-screen).
Merge branch 'master' of git://github.com/Yoast/wordpress-seo into Auto-deactivate-if-no-SPL

Conflicts:
	readme.txt
Merge pull request #1162 from jrfnl/Auto-deactivate-if-no-SPL

Auto-deactivate plugin if SPL extension not available