Fixed typo in Zend\Authentication aerticle
Fixed typo in certification exam article
Created ZF2 testing article and removed from drafts
Changed date in zf2 testing article to todays date
Added project structure and phpunit.xml to zf2 testing article
Enhanced CSS
Improved to-top button so that it is visible only with at list 300px of srollTop
Fixed scroll top in both firefox and chrome
Finished zf2 test article
Merge branch 'zf2-tests' into develop
Merge branch 'develop'