Bug 21838: Wrong alignment of instructors in course reserves

Bug 21838: Wrong alignment of instructors in course reserves

This patch adds CSS to course reserve pages so that multiple instructors
on a course are displayed well.

To test, apply the patch and:

 - Add or edit a course.
   - Test adding and removing instructors, saving, and adding and removing
     again.
 - View a course with multiple instructors and confirm that they are
   displayed well.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Awesome, Owen :-D

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>