Add team/user name checking on register page. If name was already token by others, raise error.
Add team/user name checking on register page. If name was already token by others, raise error.

remi1411/RootTheBox,shanshar06/RootTheBox,remi1411/RootTheBox,Und3rf10w/RootTheBox,Und3rf10w/RootTheBox,remi1411/RootTheBox,remi1411/RootTheBox,shanshar06/RootTheBox,Richard-West/RootTheBox,moloch--/RootTheBox,Richard-West/RootTheBox,Und3rf10w/RootTheBox,moloch--/RootTheBox,shanshar06/RootTheBox,moloch--/RootTheBox,Richard-West/RootTheBox,Und3rf10w/RootTheBox,moloch--/RootTheBox,shanshar06/RootTheBox,Richard-West/RootTheBox