Adding email verification

This commit has some model changes. It could be difficult to upgrade to
this commit.

populate.py

@@ -246,7 +246,9 @@ if __name__ == '__main__':
             name = gen_name()
             if name not in used:
                 used.append(name)
-                db.session.add(Teams(name, name.lower() + gen_email(), 'password'))
+                team = Teams(name, name.lower() + gen_email(), 'password')
+                team.verified = True
+                db.session.add(team)
                 count += 1
         db.session.commit()