re-add some files
keep only files important for installation
Merge branch 'feature-install' into development

Conflicts:
	contents/default/error.php
	contents/default/footer.php
	contents/default/header.php
	contents/default/overview.php
	include/classes/ServerStatistic.php
	include/classes/orm/Entity.php
	include/classes/orm/Material.php
	include/classes/orm/Player.php
	include/classes/orm/TotalBlock.php
	include/classes/orm/TotalItem.php
	templates/default/views/error.tpl
	templates/default/views/overview.tpl
Merge branch 'feature-portal' into development
re-add portal files