[Settings] fixed data-empty usage within checkboxes
closes #1883, no upgrade script #successkid
check for valid content, #1884
updated dependencies
updated passport-local dependency
install db dependencies in upgrade script
on group destroy, remove it from all groups

previously if a group was destroyed it was left behind in privilege
groups
Added ImageMagic to Windows 8 prerequisites
Merge pull request #1887 from derrg/master

Added ImageMagic to Windows 8 prerequisites
Merge pull request #1873 from frissdiegurke/patch-2

[Settings] fixed data-empty usage within checkboxes