Redirect User After Login

[fcaps]

if you go to a restricted site (account, leaderboard etc.) you will be redirected to login and after that to the "/" homepage.
ideally we should try to redirect the user to the original site after login, this is not possible and should also not be done in every scenario.

Acceptance criteria:

• xhr/json request are not getting redirected at all (401 with error-message)
• post/put or any "updating" action/page will not be redirected after login
• somehow the ability to "configure" where to redirect after login per route. maybe middleware.isAuthenticated(redirectTo = '/account')