On user creation, convert username to lowercase before verifying if it already exists
On user creation, convert username to lowercase before verifying if it already exists

gelatinous-toboggan/gelatinous-toboggan,gelatinous-toboggan/gelatinous-toboggan,mjimaz/gelatinous-toboggan,gelatinous-toboggan/gelatinous-toboggan,mjimaz/gelatinous-toboggan,mjimaz/gelatinous-toboggan