Bug 29002: Display patron rather than booking id in timeline

Bug 29002: Display patron rather than booking id in timeline

This patch improves the display of the bookings timeline to display who
the booking is for rather than a cryptic booking id.

Test plan
1) Follow the previous test plans
2) Navigate to the bookings display tab
3) Note that the timeline now displays each booking with the patron
   title as expected as apposed to "Booking XX"

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Janet McGowan <janet.mcgowan@ptfs-europe.com>
Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Laurence Rault <laurence.rault@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>