[CRBS] Don't allow booking to be performed while not logged in

[pferreir]

To reproduce the problem:

1. Search for a room and fill the booking dialog;
2. Open a different tab;
3. Log off;
4. Change back to the first tag and click "book";

There should be an exception.

[Ian Rolewicz <ian.rolewicz@…>]

In [887156f7f0474f08ed37fd1da9861944a8da7505]:

[FIX] RB-No-booking-if-user-not-logged

• fixes #354
• Now if the user tries to save a booking while not logged, it will be redirected to the login page before saving.
• reviewed by jbenito: finally we don't book directly because we can't save the values in the session.

[Ian Rolewicz <ian.rolewicz@…>]

In [887156f7f0474f08ed37fd1da9861944a8da7505]:

[FIX] RB-No-booking-if-user-not-logged

• fixes #354
• Now if the user tries to save a booking while not logged, it will be redirected to the login page before saving.
• reviewed by jbenito: finally we don't book directly because we can't save the values in the session.

[Ian Rolewicz <ian.rolewicz@…>]

In [887156f7f0474f08ed37fd1da9861944a8da7505]:

[FIX] RB-No-booking-if-user-not-logged

• fixes #354
• Now if the user tries to save a booking while not logged, it will be redirected to the login page before saving.
• reviewed by jbenito: finally we don't book directly because we can't save the values in the session.