multiple users add - stickers
move create_sticker and validation to model::sticker
multiple users add -  common sticker
fix tests - stickers
fix empty is_active value
fix test - admin permission has been in db two times
fix test - admin permission has been in db two times
Merge branch 'master' of https://github.com/ufal/perl-pmltq-server
quick fix of compilation error on perl 14