Strip spaces on registration and have reset password use email address instead of names (#1218)

* Usernames are now properly stripped before being used in registration checks
* Reset password function now uses email addresses instead of user names for tokens
* Prevent MLC users from resetting their password

CTFd/teams.py

@@ -105,7 +105,7 @@ def new():
 
         return render_template("teams/new_team.html", infos=infos, errors=errors)
     elif request.method == "POST":
-        teamname = request.form.get("name")
+        teamname = request.form.get("name", "").strip()
         passphrase = request.form.get("password", "").strip()
         errors = get_errors()