prevent non alpha-num usernames for now until ios fixed
allow alphanum username creation only for now
check ios version and return 409 on create user if trying to create user with extended chars on v1:1
check friendname exists in invite user
check user exists on top of user data prescence in validate user
send 204 instead of 403 on delete friend if nothing to be done
return 409 when attempting to create user with extended chars unless on new versions
return null for error when no cookie sent so that socket.io returns 403 and not 500
return null for error when no cookie sent so that socket.io returns 403 and not 500