Refactor: removed legacy upgrade script that is no longer supported
Refactor: removed debugging code
Fixed Does not protect against clickjacking (issue #540)
Merge branch 'develop' into bugfix/540-clickjacking-protection

Conflicts:
	www/previewfile.php
Merge pull request #541 from janus-ssp/bugfix/540-clickjacking-protection

[REVIEW] Bugfix/540 clickjacking protection